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->'''Dave:''' Open the pod bay doors, HAL.\\
'''HAL 9000:''' [[AC:I'm sorry, Dave. I'm afraid I can't do that.]]

A 1968 science-fiction film, written and directed by Creator/StanleyKubrick, with help from Creator/ArthurCClarke (who also wrote a novel version in tandem with the film's production), and inspired in part by Clarke's short story "The Sentinel", regarded as one of the greatest and most influential films ever made.

The film's story tracks long-term human evolution as it is influenced by unseen [[{{Precursors}} aliens]]. The unearthing of one of their artifacts on the moon leads to an ill-fated expedition being dispatched to Jupiter, culminating in a famously [[GainaxEnding incomprehensible]] climax. (The novel offers ''an'' if not ''the'' explanation for the latter.)

Still one of the [[MohsScaleOfScienceFictionHardness "hardest"]] sci-fi films ever made, it is known for its very slow pacing and enigmatic plot. It's also the reason you see [[http://www.youtube.com/watch?v=IFPwm0e_K98=thus+spoke+zarathustra Thus Spoke Zarathustra]] paired with sunrises, and [[http://www.youtube.com/watch?v=_CTYymbbEL4=blue+danube+waltz Blue Danube Waltz]] paired with zero-gravity.

Clarke went on to write [[Literature/TheSpaceOdysseySeries several sequel novels]] (titled ''2010'', ''2061'', and ''3001'') [[RetCanon which mostly followed the film's continuity]]. One of them was made into a movie as well (''[[Film/TwoThousandTenTheYearWeMakeContact 2010: The Year We Make Contact]]''), with ''3001'' currently in development under Creator/RidleyScott.

In 1976 Creator/MarvelComics published a ComicBookAdaptation of the film written and drawn by Creator/JackKirby, followed by an ongoing series which ran for ten issues. The first seven issues focused on the Monolith aiding various humans in the past and the future, while the last three focused on X-51 a.k.a. Machine Man, who was later incorporated into the Franchise/MarvelUniverse. The Monolith returned in the last two issues of X-51's 1999-2000 series, in which it was revealed that it had been created by the Celestials.

HAL has also made an unexpected appearance in the MassiveMultiplayerCrossover videogame ''VideoGame/LegoDimensions''- developed by Creator/WarnerBros (as a result of the Time Warner/Turner merger of 1996, they own the rights to this movie). He pops up through a rift in the ''VideoGame/{{Portal}}'' level, interacting with- who else?- [=GlaDOS=].

----
!!This film provides examples of:
* AbsentAliens: The film may, or may not, contain aliens; the beings who set up the monoliths, receive Dave Bowman in the pseudo-hotel room and are heard only as high-pitched, rapid chittering noises may, or may not be evolved humans. The "Star Child" is presumably the hyper-evolved Bowman, but how this transformation takes place is not specified.
* AcidTripDimension: Dave going through the Star Gate is probably the most famous example.
* AdaptationExpansion[=/=]TheFilmOfTheBook:
** Clarke's original short story, "The Sentinel", dealt only with the part about the Monolith on the Moon. Kubrick and Clarke then expanded the story into a film and book that were released simultaneously. Clarke stated the book should be credited as "Clarke and Kubrick", with "Kubrick and Clarke" credited for the screenplay. Unlike a {{Novelization}}, there are distinct differences between the two; for starters, Clarke's ''Discovery'' travels to one of Saturn's moons, while Kubrick's ''Discovery'' goes to Jupiter. The reason for this change was to avoid a SpecialEffectFailure: the film crew couldn't build a model of Saturn that Kubrick liked, so he changed it.
** The rings of the Saturn model, constructed using the best available information, looked too "artificial." Then Voyagers I and II zoomed by and, in retrospect, it turned out that their model was pretty accurate.
** The switch to Jupiter (which Clarke kept in the book sequels) was fortuitous, as Europa, a moon of Jupiter, was later discovered to have a largely ice/water crust, raising many possibilities for setting life there.
* AdaptationalVillainy: In the book, HAL-9000 is a beautifully-defined and deeply sympathetic character who is so human that he develops a psychosis, and his reasons for why he takes the actions he does are completely explained. [[spoiler: The instructions that he was given from the White House to conceal the monolith clashed with his basic programming not to conceal information from the crew. HAL was working on a non-murderous solution to the problem, but overheard plans from MissionControl to temporarily disconnect him. HAL didn't understand the concept of sleep and thought that this would kill him, so he panicked.]] The movie, deprived of the ability to use a narrative voice to make this clear, makes HAL seem far more monstrous than the original intent, and sadly the film is often cited as an example of AIIsACrapshoot.
** Creator/HarlanEllison in his contemporary review thought it was possible the ''aliens'' had sabotaged HAL in order to kidnap Dullea and learn all about humanity from studying his mind.
* AffablyEvil: HAL is programmed to be friendly and easy to work with, albeit somewhat narcissistic.
* AIIsACrapshoot: HAL goes rogue and murders the crew of ''Discovery'' because of a LogicBomb accidentally created by his programmers. This became an archetypal example of "malevolent AI" in popular culture, especially since the film version doesn't adequately explain the reasons for his malfunction.
* AlasPoorVillain: [[spoiler:HAL basically goes out begging for mercy and appealing to Dave's friendship while he is slowly lobotomized.]]
* AlienGeometries: The moving, floating tesseracts from the "beyond the infinite" sequence. Also, see FirstContactMath, below.
* AliensStealCable: In the novel, the "hotel" area constructed by the Firstborn to receive Bowman is based on TV broadcasts received by the Monolith. The hotel room is supposed to give Bowman [[AFormYouAreComfortableWith an environment he's comfortable with]], but in the movie the [[{{In-Universe}} aliens]] clearly did not research things very well, because a room with lights in the ''floor'' looks intensely disturbing. They also put the bathroom mirror over the tub instead of the sink. In the book, there are other anomalies, such as writing that is blurry in close-up, and all the food containers have an identical substance that in no way resembles human food while still being perfectly nutritious.
** There's also a TV in the room which works. Much to some relief of Bowman who's happy to hear human voices. He noticed the programs were broadcasted around the same time the Monolith was discovered.
* AllThereInTheManual: Clarke's accompanying novel spends considerable time providing explanations for the more opaque aspects of the film.

** The book and movie complement each other. The book explains the more confusing parts of the movie including the starchild and the final "Jupiter and Beyond the Infinite" sequence which the movie conveyed through spectacular imagery. The reason for this was that the book was written as the same time as the film.
* AllThereInTheScript: Although the film leaves it mysterious, early script drafts made clear that HAL's breakdown is triggered by authorities on Earth who order him to withhold information from the astronauts about the purpose of the mission (this is also explained in ''Film/TwoThousandTenTheYearWeMakeContact''. Frederick Ordway, Creator/StanleyKubrick's science advisor and technical consultant, stated that in an earlier script Poole tells HAL there is "... something about this mission that we weren't told. Something the rest of the crew knows and that you know. We would like to know whether this is true", to which HAL responds: "I'm sorry, Frank, but I don't think I can answer that question without knowing everything that all of you know." HAL then falsely predicts a failure of the hardware maintaining radio contact with Earth (the source of HAL's difficult orders) during the broadcast of Frank Poole's birthday greetings from his parents.
* Music/AlsoSprachZarathustra: The use of this composition as a {{leitmotif}} is so famous that [[Wrestling/RicFlair almost]] every use since then is a reference to (or parody of) ''2001''.
** It was almost not included as a score was written for the movie, while the public domain classical music was just a placeholder while they were waiting for it. Kubrick thought, and the majority of the viewing public agreed, that Music/AlsoSprachZarathustra was much better.
* AndIMustScream: The flash-cuts of Bowman's horror as he's taken Beyond The Infinite. The journey reduces him to a quivering wreck--then he appears in the alien hotel room. It appears that that will turn out to be Bowman's purgatory, but it's ultimately averted as Bowman [[AscendToAHigherPlaneOfExistence Ascends to a Higher Plane of Existence]].
* AndYourRewardIsInfancy: Dave is turned into a Star Child at the end.
* AntiMutiny: Although not made explicit, HAL rebels in order to protect the ''true'' mission, which would die with him as he was programmed to keep it a secret until they arrive.
* ArcSymbol: "Magical alignments" of the Sun, planets, moons and the Monoliths.
* ArcWords: In the novel: "But he would think of something." Doubles as BookEnds.
* ArtificialGravity: The film version used the centrifugal method of gravity generation onboard both the space station and the ''Discovery''. It's notable that the non-rotating parts of ''Discovery'' and the famous shuttle sequence near the beginning are as being zero gee, through actors walking strangely in "velcro booties," and dangling props from wires, etc.
** On the other hand gravity in the Moonbase appears to be Earth-normal without explanation.
* ArtificialMeat: Dr. Floyd and his crew have sandwiches on the way to the crater dig, one being "something like" chicken -- they comment that they're getting better.
* ArtisticLicensePhysics:
** When Floyd drinks out of a straw in zero-g, the liquid moves back down.
** The Aries lands with its cockpit windows facing upward, so the pilots shouldn't be able to see the Earth moving up past the windows. (Perhaps the windows have some kind of transparent display overlay?)
** When the Earth is seen from the moonbase at Clavius and the Monolith dig site in Tycho, it's oriented with north pointing upwards. However, Clavius and Tycho are in the Moon's southern hemisphere, so the Earth should have been upside-down.
** In some scenes where Frank or Dave are jogging around the center ring, you can tell they are not ''quite'' at the "bottom" of the set and thus are at a slight angle where they wouldn't typically be at one. This is when the camera itself is occupying that spot.
** The people wearing the shoes that stick to the floor ''try'' to walk the way they would in zero G, but in reality they would be slightly fighting the inertia of their upper bodies wanting to stay behind. Instead they just walk as if through glue.
** The spacecraft that travels between Clavius and Tycho moves in a straight line and makes a constant droning sound, just like a terrestial airplane. In reality, due to the lack of air, the most efficient way to travel even smaller distances would be a ballistic trajectory, and the craft would make no sound at all except at takeoff and landing. At all other parts of the film, spacecraft movement is portrayed more realistically.
** The ''Discovery'' was designed at first having large panels to dissipate waste heat from her reactor as RealLife similar ships have been thought will have. They were removed for the screen model on the basis [[RealityIsUnrealistic people would thought they were wings]] and not heat dissipation units.
** ''Discovery's'' "Pod Garage" deck is not in the centrifuge and therefore should have been weightless. Although Frank and Dave always stand only on the black Velcro pads on the floor, they don't walk like they're stuck to Velcro and frequently lean on things.
* AscendedToCarnivorism: What the man-apes do with help from the Monolith.
* AscendToAHigherPlaneOfExistence: The purpose of the Monolith's "trap", set for the first human to stumble upon it. Also the "evolution" of the Firstborn.
* AsceticAesthetic: Aside from the "Dawn of Man" segment, the film practically ''defines'' this trope.
* AsteroidThicket: Averted. While passing through the asteroid belt, ''Discovery'' passes within visual range of one asteroid. They deliberately chose their route to bring them close enough to make observations of that asteroid.
* AutoKitchen: When the astronauts want to eat, they go to a wall unit and press buttons. Within a few seconds, trays of food are heated and appear behind sliding glass doors.
* AvoidTheDreadedGRating: Inverted. As a quirk of the way the MPAA started implementing its ratings system in the late '60s, ''2001'' is rated G, even though the scene of Moonwatcher beating his enemies' leader to death would certainly qualify it for PG today. Modern re-releases of the movie are usually labeled "Unrated".
* BatmanCanBreatheInSpace: Averted quite well. During Bowman's famous emergency spacewalk from his pod to the ''Discovery'', he's shown to be carefully hyperventilating before blowing out his breath so his lungs won't explode in the sudden vacuum.
** [[ExplosiveDecompression The "explode" word is a bit]] [[StealthPun overblown]]... it would however quite tear them to the point of severe internal bleeding and inability to provide blood oxygenation. Also, it might hurt a bit.
** Although hyperventilating doesn't really over-oxygenate your blood (the blood in your arteries is already holding just about all the oxygen it possibly can; anything below 95% of capacity is an indication that something's wrong, and below 90% is a cause for serious concern). It just lets you go longer before your breathe reflex (which is based on carbon dioxide levels) becomes overwhelming. That's why swimmers who hyperventilate before diving still run the risk of blacking out: they use up all their oxygen but are unaware and don't feel the need to surface for breath.
** It's also significant that he really is only exposed to hard vacuum for a very short time -- about twelve seconds or so. A fit adult could ''probably'' survive that without any serious medical effects.
* BattleChant: Subverted with the hominids. When Moonwatcher's group first encounters another group at the waterhole, the two groups shriek and howl at each other until Moonwatcher's group retreats. Soon after, Moonwatcher's group has contact with the monolith. When the two groups meet again at the waterhole, the second group makes a cacophony, while Moonwatcher's group is silent. The second group mistakes this for weakness, and their leader charges. Moonwatcher easily clubs his foe to death, causing the second group to quail and retreat. Silence, in this case, proved more unnerving than bluster.
* BenevolentPrecursors: The Firstborn helped the human race to evolve in the first place.
* BigBad: The leopard in the "Dawn of Man" segment, and HAL in the "Jupiter Mission" segment. The "TMA-1" and "Jupiter and Beyond the Infinite" segments have NoAntagonist.
** In the novel, Moon-Watcher's group even fought the leopard and killed it.
* BigBrotherIsWatching: HAL has cameras in every compartment of the ''Discovery'' that we see.
* BigWordShout: "HAL!"
* BlandNameProduct: {{Lampshade|Hanging}}d to an extent. HAL's designer patently denies any relation between the computer and Creator/{{IBM}} - whose initials are all one letter after H-A-L. Per WordOfGod, Clarke did not intend this, but rolls with it in the story.
* BlueAndOrangeMorality: The Firstborn, the aliens who built the monoliths. The way the books put it:
-->''And because, in all the Galaxy, they had found nothing more precious than Mind, they encouraged its dawning everywhere. They became farmers in the fields of stars; they sowed, and sometimes they reaped. And sometimes, dispassionately, they had to weed.''
* BoldExplorer: Dave Bowman, Frank Poole, and the deceased crew of the Discovery, who are on an expedition to explore strange findings near Jupiter.
* BookEnds:
** The film has shots of the Earth, Moon, and Sun, accompanied by "Thus Spoke Zarathustra". There's a theory that the opening shot is actually from the Star-Child's perspective, and that the rest of the film is a flashback.
** The first and last twenty-five minutes also have no dialogue and start and end with a two minute blank screen of just music.
* BurialInSpace: Dave Bowman releases Frank Poole's body into space mainly because he needs both of the space pod's arms to open the emergency airlock. (In the novel, after deactivating HAL he does the same with the men killed in hibernation. In the ''3001'' novel, Frank gets better.)
* TheCallLeftAMessage: The aliens buried a Monolith on the moon. Once humans dug it up, it sent a transmission to Jupiter, alerting whatever is at Jupiter that humanity had evolved to the point where it could land on the Moon.
* CentrifugalGravity: The iconic ring station in orbit, and the rotating crew module of the Discovery.
* CharacterSignatureSong: Hal 9000 will forever remain associated with the song "Daisy Bell".
* ChekhovsGun: The "Explosive Bolts" label on the pod doors.
* ChummyCommies: The Soviet characters are friendly enough to Heywood Floyd (remember, nobody thought the USSR was going anywhere in 1968).
* ClashOfEvolutionaryLevels: Moonwatcher's tribe versus the Others basically boils down to this, with some evolutionary help from TheMonolith.
* ColonizedSolarSystem: There are multiple colonies on the Moon. The Americans have to close off their Clavius base when TheMonolith is discovered.
* ColorCodedCharacters: Dave Bowman has a red spacesuit and Frank Poole has a yellow one (though their regular clothes are both similar shades of grey). There is also a blue spacesuit visible in the background of some shots and Dave pulls the helmet from an otherwise-unseen green one, probably both intended for the three crew members in hibernation before they were killed by HAL.
* CommercialBreakCliffhanger: The film was originally shown in theaters with an intermission. The scene immediately before the intermission? Dave and Frank talking in the pod, thinking HAL can't hear them...and HAL reading their lips.
* TheComputerIsACheatingBastard: HAL exploits the fact that Frank Poole is mouthing his moves in order to predict his chess strategy. [[spoiler: This foreshadows the lip reading sequence as Poole and Bowman plot to deactivate HAL.]]
* TheComputerIsYourFriend: Until he snaps and kills you, that is.
* CoolSpaceship: The ''Discovery''.
* CosmicHorrorStory: This was the real reason for Kubrick's use of LeaveTheCameraRunning and MindScrew: to convey that space is an immense and hostile place in which humans are insignificant by comparison, where if we encounter aliens they'd be incomprehensibly advanced, refuse to explain themselves to us, and be interested only in using us as tools. Lampshaded in the out-takes book ''The Lost Worlds of 2001'', which covers parts of the astronauts' pre-mission training. They are told simply to take lots of pictures and not to try too hard to make sense of what they see... and to hope their hosts (if any) are aware of their limitations.
* CrazyPeoplePlayChess: A GeniusBonus for chess enthusiasts is found in the game that HAL 9000 and Poole play; although HAL predicts mate, there's actually a way for Poole to avoid it. A subtle hint at HAL's error-prone nature...
* CreepyMonotone: A downplayed example, Hal's voice probably set the standard for the use of this trope in AI, though it isn't a true monotone. While perpetually calm and polite, he's actually much more expressive than any other character. You can tell that he sounds a bit annoyed when Frank keeps questioning him.
-->'''HAL:''' [[AC:None whatsoever, Frank! Quite honestly, I wouldn't worry myself about that.]]
** Harlan Ellison's review calls HAL's mannerisms "faintly high CampGay".
* CryonicsFailure: HAL intentionally kills the three hibernating astronauts by forcing a malfunction in the coldsleep system; in the novel, he depressurizes the ship as Bowman attempts to wake all three of them.
* {{Cukoloris}}: ''2001'' was the first movie to show computer monitors projecting their images onto the user's face. This is pure RuleOfCool, because in order to get this effect in real life you'd have to be staring straight into the bulb of a projector. There were 16mm projectors behind all the flatscreens on the sets, so all Kubrick had to do was take the screens off.
* CuttingTheKnot: HAL's solution to the LogicBomb he is unintentionally presented.
* CyberCyclops[=/=]GlowingEyesOfDoom[=/=]RedEyesTakeWarning: HAL again.
* DangerDeadpan: The ''Discovery'''s mission controller, who was played by an actual U.S. Air Force radio operator stationed in England, whom Kubrick hired because he couldn't find any actors who could do this kind of voice.
* DataCrystal: The hard drives of the HAL 9000 computer are shown as blocks of clear crystal/glass. David Bowman manually ejects them from their drive bays in order to disable HAL.
* DataPad: Dave and Frank use thin tablets to watch themselves being interviewed by Creator/TheBBC.
* DecapitationPresentation: In the novel, Moon-Watcher presents a severed (leopard) head on a stick to the other group of hominids.
* DepthOfField: The shot from the perspective of HAL's cyber-eye.
* DerelictGraveyard: In the novel, Dave came across one while being led through the stars. He noticed many ships of different designs - "spheres, faceted crystals, slim pencils, ovoids, disks".
* DeweyDefeatsTruman: All of the series have already been invalidated this way, one way or another. For example, the first three books all feature a still-existing USSR; the backstory of 2061 involves a revolution in South Africa in the 2030s which overthrows the apartheid regime; then of course there's the invention of HAL. Creator/ArthurCClarke went on record to state that the 'sequels' were actually stories taking place in alternate universes when current events surpassed his stories.
* DistantPrologue: "The Dawn of Man".
* DramaticSpaceDrifting: Frank Poole after his oxygen line is cut by HAL.
* DroneOfDread: The {{Mood Motif}}s associated with the Monolith.
* EarAche: The leader of the rival man-ape group is called One-Ear in the novel. He's probably the one who ended up getting beaten to death by Moon-Watcher's bone in the movie.
* EerilyOutOfPlaceObject: The monolith appears before Moonwatcher's tribe without forewarning, and the primates shriek and howl at the ominous block. Later in the story, geologists on the moon uncover a similar monolith, which they estimate was buried there millions of years ago. It emits a piercing shriek across several radio frequencies once the rising sun shines upon it.
* EldritchAbomination: The Black Monolith. Think about it: it's a thing of AlienGeometry, a perfectly-proportional inert black slab that may or may not exist across multiple dimensions. It's unfathomably powerful, capable of uplifting living beings to sentience or helping them Ascend to a Higher Plane of Existence. It operates on a moral code that no mortal being can comprehend. And it's either incapable or unwilling to directly communicate its intentions to humanity. Although it's more benevolent on the whole than most examples, strictly speaking it does qualify.
* ElectronicSpeechImpediment: When Bowman disassembles HAL's neural circuitry, it reverts to demo mode and sings "Daisy Bell" in an [[LettingTheAirOutOfTheBand increasingly slow, distorted manner]] before finally shutting down.
* EnergyBeings: The extraterrestrials have somehow woven themselves into the fabric of space-time in [[MindScrewdriver the novel]].
* EscapePod: Technically, the EVA pods, although they are not used for this, and there would be no way to rescue them anyway, save sending another pod from the same vessel. They're more like Maintenance Pods, really.
* EtherealChoir: G. Ligeti's 'Requiem' is used with the apelike proto-humans (and later the less ape-like humans) encountering the uncomprehensible.
* EverybodysDeadDave: I think you know the problem as well as I do, Dave. (Note that the TropeNamer for this trope is ''Series/RedDwarf'', which may have been making a ShoutOut to ''2001''.)
* EverythingIsAnIpodInTheFuture: UrExample--the iPod was ''named after'' the space pods in this movie, and the white surfaces and black control panels on all of ''Discovery'''s equipment were an inspiration for its design. Similarly, the novel describes a device that is extremely similar to modern concepts of the tablet computer.
* EvolutionaryLevels: Self-evolution, but still mentioned--the Firstborn's status as {{Energy Being}}s is stated to be the ultimate stage in physical evolution. "And beyond that, there could only be God." The opening "Dawn of Man" sequence is about the Firstborn giving human evolution a kick in the pants.
* ExactTimeToFailure:
-->'''HAL:''' I've just picked up a fault in the [=AE35=] unit. It's going to go 100% failure in 72 hours.
* ExplosionsInSpace: In an aversion of the typical trope, the explosive bolts that decompress Bowman's EVA pod go off silently with just a puff of gas.
* ExplosiveDecompression: Averted. (Though used in the literal, scientific sense in that Bowman went almost instantly from full external air pressure to vacuum when he blew the pod's explosive bolts.)
* {{Expositron 9000}}: HAL of course. Just don't assume he's telling you everything though.
* ExpospeakGag: PlayedForDrama. When Hal cuts off the life support for the three hibernating astronauts, an alarm goes off and a monitor flashes "Computer Malfunction" then "Life Functions Critical". A systems status monitor shows the astronauts' bodily functions flatlining one by one (and in a subtle, disturbing note, the last function to go "Central Nervous System", i.e., the brain goes haywire for several seconds before flatlining, hinting that the astronauts' deaths were anything but painless). Finally, the alarm shuts off, and the monitor flashes the message "Life Functions Terminated."
* ExtremeGraphicalRepresentation: The Discovery's displays, which are rather fancy for the amount of data they apparently contain.
* EyeLightsOut: HAL when Dave turns him off.
* EyeMotifs: HAL communicates via the red eye of its camera, and we see the lightshow of the stargate reflected in Bowman's eye.
* FacelessEye: HAL is probably the most iconic example.
* FailedFutureForecast: The film has so many that it pretty much has every sub-trope above covered (except the apocalypse ones). Notable: taking a Pan Am space shuttle to a commercial moonbase, and Turing-testable strong AI.
* FailsafeFailure: Averted and lampshaded a bit in the book. The makers of the failsafes of the airlock doors had mentioned, "We can protect you from stupidity, we can't protect you from malice."
* FamousLastWords: Lampshaded by name, see Foreshadowing, below.
* FasterThanLightTravel: It is not clear whether this really takes place in the movie or not. For the vast majority of the film, space travel is shown in a very realistic manner, and the point where FTL ''may'' be taking place could be interpreted in other ways. It quite explicitly does take place in the novel version (and the first sequel), but is subsequently {{retcon}}ned in later novels, with the WordOfGod explanation that each of the four is in its own "universe," [[BroadStrokes with just enough continuity overlap for it to make sense as a series]].
* FetalPositionRebirth: The Star Child.
* FinalGirl: Dave is a RareMaleExample when he is the last crew member left alive to shut down HAL 9000.
* FirstContactMath: In the novel, Bowman tries unsuccessfully to communicate with the Iapetus monolith by broadcasting primes at it. Unsuccessfully in this case because it already knows he's there and what it intends to do with him. There is some speculation as to whether the 1:4:9 ratio of the monolith's sides is significant in this respect; it is, but the details are never revealed.
** In other material, that ratio is explained as being a reference to the quadratic sequence of positive square integers.
* FishEyeLens: What most of Hal's point of view shots are in.
* {{Flatline}}: The three HumanPopsicle astronauts killed by HAL flatline. They don't get better. The computer display changes to "Life Processes Terminated." This also happened to Frank Poole, showing an entire battery of monitors slowly decaying to all flatline.
* FoodPills: Meals include a collection of zero-g liquids sucked up through straws, horrible-looking preprocessed sandwiches, and trays of (essentially) Astronaut Chow on ''Discovery''. It all almost makes the raw tapir meat the ape-men eat at the Dawn of Man look appetizing. The book, on the other hand, has the food on ''Discovery'' be designed to be just like "real" food, including fresh-baked bread, in order to help make the years long space trip tolerable.
** WordOfGod has it that the food in the movie was intended to resemble baby food, on the grounds that, as far as spacefaring civilizations go, the human race is extremely infantile. The three things all babies have to learn is how to eat, walk, and control their own bodily functions. Spacefaring humans are shown taking babysteps with Velcro shoes around the cabins of spaceliners, eating stuff that resembles baby food, and needing a lengthy instruction manual to use the space toilet (see NobodyPoops below) to highlight humanity's childlike status.
* {{Foreshadowing}}, doubling as TemptingFate:
-->'''HAL:''' [[AC:Let me put it this way, Mr. Amor. The 9000 series is the most reliable computer ever made. No 9000 computer has ever made a mistake or distorted information. We are all, by any practical definition of the words, foolproof and incapable of error.]]
** {{Lampshade|Hanging}}d by Dave when he's discussing the HAL situation with Frank in the EVA pod. He points out that the statement about the 9000 series having a perfect operational record sounded rather too much like FamousLastWords for his taste.
** In the sequel (for those who didn't read the original novel), the previous and following statements were proven true, making the foreshadowing truly epic, although the fate tempting loses a little credence.
--->'''HAL:''' [[AC:It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error.]]
** Interestingly enough, the error isn't inherent in HAL, either hardware or software, as it was stated by an engineer that the technology in the ship was made to be accident proof and idiot-proof but nothing could make any machine proof against malevolent intent. In this case it was the secret orders given to HAL (while not all that malevolent in nature) that conflicted with his primary programming and caused him to malfunction spectacularly.
** In a non-HAL example, the prominent warning label on the pod doors about the explosive bolts.
* FrazettaMan: Moonwatcher and the gang. They were just your ordinary apes of the savannah until the Sufficiently Advanced Alien artifact taught them basic tool-use and they learned how to fight off predators as a group and use weapons against rival tribes.
* FunWithAcronyms: Though Clarke claimed it was unintentional, many readers have noted that if you shift each letter in HAL one letter forward, you get IBM.
* GainaxEnding: Jupiter and Beyond the Infinite, far more so in the film than the book, where it's explained in a fair bit of detail.
* GenreSavvy: Frank and Dave are smart enough to recognize that discussing the potential malfunction of a self-aware computer in earshot of said computer would be a very unhealthy mistake and so take great care to make sure he can't hear them. They are also able to recognise that the assertion that the 9000 series is perfect sounds disturbingly like FamousLastWords. [[spoiler: Unfortunately their precautions are insufficient because HAL was able to lip-read everything they said through the pod window, and only Dave is able to save himself when HAL's rampage commences]]
* GooGooGodlike: In the climax, David Bowman's final, god-like form is the "Star Child", which mostly resembles a human baby.
* GovernmentConspiracy: The U.S. government tries to cover up the discovery of the Monolith by cutting off all communication to Clavius Base, spreading rumors about an epidemic, and concealing the Monolith's existence from Dave and Frank.
* TheGreatPoliticsMessUp: The USSR is not explicitly mentioned in the film, but it is in the novel and Kubrick does not make any mention to Russia either in the movie. The Soviet Union is surprisingly healthy in 2001, and the relations with the US are remarkably amicable, from the point of view of the 1960s (Kubrick's previous film '''was''' ''Film/DoctorStrangelove''). They have built a huge space station together, and are generally cooperating in the exploration of the Moon. The Russians being suddenly shut out of the Clavius moon base is seen as a very unusual event.
* HalfwayPlotSwitch: The monolith storyline ''does'' come back at the end, however people who start to scratch their heads as Dave deals with HAL and think "Wait--I thought this movie was about that monolith thing.." can be excused for doing so.
* HappyBirthdayToYou: Frank's parents sing "Happy Birthday" via a prerecorded message.
* HemisphereBias: Although the Earth as seen from the moon looks unrealistically washed out (see ScienceMarchesOn), North America is always visible every time we see it.
* HellIsThatNoise:
** The ape men's screams are very disconcerting to hear.
** In the novel, Moon-Watcher woke up to the sound of something sliding across the dirt, and then "the clank of metal upon stone". It was the Monolith. Later, [[JungleDrums drumming sounds]] came from it to hypnotize the man apes into doing tasks.
* HitlerCam: The scene of Bowman unlocking the door to HAL's Logic Memory Center and crawling inside is shot from a worm's-eye-view: the camera is on the floor and Keir Dullea has to step over it. By making him look huge and threatening, Kubrick gives us the impression that Bowman is going on a RoaringRampageOfRevenge against HAL without him having to say anything.
* HollywoodWebcam: Justified. A VideoPhone interview between Earth and the astronauts is broadcast on television. The time lag (6 hours) is mentioned, but it has been edited out specifically for broadcast.
* HumanPopsicle: The hibernation systems. The trip is one of months, not centuries, but suspended animation is used to avoid the problem of having to pack several months' worth of food, and to help keep secret the real purpose of the mission.
* HyperspaceIsAScaryPlace: The "Stargate" sequence, ''and how''. See AndIMustScream above.
* ImprovisedMicrogravityManeuvering: Dave Bowman uses the explosive decompression of the air inside his travel pod to return to the Discovery's airlock.
* InCameraEffects: The long shot of astronauts in the lunar excavation used bipacking.
* InSpaceEveryoneCanSeeYourFace: Mostly averted. The shot of Dave pushing a button to tint his spacesuit visor serves to hide the face of the stuntman used in the rest of the scene.
* {{Intermission}}: The rumbling sound of the ventilation system in the pod bay can be heard through most of the intermission, then Ligeti's ''Atmospheres'' plays to warn the audience to return to their seats.
* InvisibleAliens: Sort of. While there is ample evidence for the presence of alien intelligences, neither humanity, nor Dave Bowman, nor the reader/viewer ever finds out what the actual aliens themselves look like. In the novel it's revealed that they had long since [[EvolutionaryLevels evolved]] into EnergyBeings.
* IWantMyJetpack: In 2001, we have manned interplanetary spaceflight, permanent bases on the Moon, suspended animation, and sentient computers. Contrast with Zeerust below.
* JitterCam: Used for effect in the third act: "My God, it's full of stars!"
* JumpCut: About two seconds before the famous MatchCut (see below), there was a jump cut that showed the bone tool spinning in the opposite direction. This cut is a bit jarring and piques the viewer's attention just in time for the cut-to-spaceship.
* JumpScare: In the novel, Moon-Watcher has woken up to the sound of falling pebbles. He looks down from the edge of the cave to see a leopard climbing up towards him.
* JungleDrums: Coming from within the Monolith in the novel.
-->For the first time-and the last, for three million years-the sound of drumming was heard in Africa.
* KeepingSecretsSucks: For HAL, and for everyone else when HAL starts having problems with it.
* KillSat: The [[MatchCut bone-turned-satellite]] from the opening is one according to WordOfGod. This makes the MatchCut deeper than it initially appears; they are similarly shaped, but also both weapons.
* KubrickStare:
** Dave Bowman does it when he runs the diagnostic on the AE-35 unit, goes up to disconnect HAL, and arrives in the alien hotel room at the end.
** Frank Poole does it before confronting HAL about why he alerted them to the failure when there was obviously nothing wrong with the AE-35.
** Even HAL's red eye seems to create this effect in certain shots (for example, [[spoiler: right after killing the hibernating astronauts.]]
* KuleshovEffect: By a ''prop'', no less! The film conveys HAL's emotions simply by shooting his single camera "eye" from different angles and durations.
* LamarckWasRight: In the novel, the man-ape Moon-Watcher being made intelligent by the monolith is described thus: "The very atoms of his simple brain were being twisted into new patterns. If he survived, those patterns would become eternal, for his genes would pass them on to future generations." If the monolith wanted the patterns passed on, it should have been doing the twisting a bit lower down...
* LatexSpaceSuit: The spacesuits follow this design. Justified as people are working on similar outfits today.
* LeaveTheCameraRunning: Often cited as one of the film's shortcomings, in the many lengthy shots (by today's standards).
* {{Leitmotif}}: The film used "''Also Sprach Zarathustra" for two key scenes, both times when humanity (or its forebears) made some kind of evolutionary/spiritual leap.
* LettingTheAirOutOfTheBand: Used for dramatic effect when HAL 9000 sings "Daisy Bell" (better known as the "Daisy, Daisy" song, or "A Bicycle Built For Two"). It is an indicator that HAL's mind is going. He can feel it.
* LogicBomb: Revealed in the novel (and the movie ''2010'') as the cause of HAL's malfunction. [[spoiler:HAL is programmed not to keep secrets. And ordered to ensure that the human crew of ''Discovery'' do not learn about what is at Jupiter. So he sets about breaking contact with Earth and [[MurderIsTheBestSolution killing the crew]], [[CuttingTheKnot so there will be nobody to hide the secret from]].]]
** The novel suggests that [[spoiler:HAL might been able to eventually resolve the problem peacefully, had mission control not requested his temporary disconnection. HAL, being unable to grasp the concept of sleep, was convinced that the disconnection would have meant the end of his existence and his killing spree was therefore, all in all, a misguided attempt at self-defense.]]
* LookOnMyWorksYeMightyAndDespair: "No 9000 computer has ever made a mistake or distorted information." It's debatable whether or not you could say HAL 9000 "made a mistake", but either way it murdered four people.
* LowAngleEmptyWorldShot: The only actual outside shot was the scene where the proto-human smashes the skull and bones, shot in a field on a raised platform from down low to get the sky in the shot and to avoid the cars and trucks in the background.
* LudicrousSpeed: The Stargate sequence. Granted, it's not the trip itself that changes Dave, but it certainly seemed to affect him deeply. Of course, only the book really makes it clear that ludicrous speeds are even involved, while the film is a better example of the trope...
* MachineMonotone: HAL 9000 always talks in a near-monotone with just enough inflection to put it in the UncannyValley. Towards the end of the movie, when Dave is essentially lobotomizing him, HAL goes from trying to reason with Dave to pleading for his life, stopping only when he reverted to factory settings and began singing a rendition of "Daisy." All in the same calm, polite voice.
-->'''Dave:''' Open the pod bay doors, Hal.
-->'''HAL 9000:''' I'm sorry Dave, I'm afraid I can't do that.
* MachineWorship: In the novel, the Builders of the Monolith went through a phase where they uploaded their consciousness to starships, before evolving into pure energy.
* MasterComputer: HAL.
* MatchCut: The bone club thrown in the air by the ape-man turns into an orbiting satellite--by WordOfGod, a nuclear launch platform, making the cut metaphorical as well as visual.
* MechanicalLifeforms: The {{Precursors}} went through a stage of this as a part of their self-guided evolution, before going onward into energy beings.
* MickeyMousing:
** The film used this for several extended scenes, including spacecraft in flight. The music wasn't actually written for the film, so they simply chose the most accurate piece to use for the individual sequence.
** The score as we know it was originally just used by Kubrick as make-shift editing music, so he'd have something to work with. It turned out he liked it so much he threw the entire original score, which had already been written and recorded, out of the window. (And this may have been his plan all along: Also Sprach Zarathustra, in particular, is ''suspiciously'' thematically appropriate.)
* MindScrew: The book, on the other hand, is vastly more comprehensible.
** Allegedly a sizable voice over was recorded, but Kubrick nixed it to avoid the effects of movies like Blade Runner. To be fair, it probably wouldn't have had the same effect and cemented Kubrick's directorial style, but it would have probably given the audience a clue as to what was happening.
** A popular urban legend (later confirmed by Arthur C. Clarke himself) goes that, after the premiere, Rock Hudson stormed out of the theater yelling, "Can someone tell me what the hell I just watched?"
** The movie was such a mind screw that the film adaptation of ''Film/TwoThousandTenTheYearWeMakeContact'' was largely devoted to ''[[MindScrewdriver trying to explain what had happened in the last movie]].'' You may not have heard of this sequel. There's an excellent reason for that.
** Ironically, its status as an enormous mind screw helped it grow in popularity with the counterculture (specifically with LSD users) at the time after a large number of regular moviegoers had been driven away by the incomprehensibility of it all. Reviewers who had initially given it negative reviews due to the weirdness on first viewing grew to like it on later viewings.
** The prologue and ending of the original book of ''2001'' are significantly longer than their movie equivalents for the same reason. There was a lot of 'splaining to do.
* MinimalistCast: If you don't count the apes in the prologue, there are only a handful of characters -- Dr. Floyd and his team in the Moon sequence, and Dave, Frank, HAL and the briefly appearing MissionControl in the rest of the film.
* MisplacedWildlife: The tapirs in the first part of the film, which aren't native to Africa. In the novel they were warthogs, but Kubrick couldn't find anyone in England who could rent him warthogs on short notice.
* MissionControlIsOffItsMeds: HAL 9000. In the novel, the actual Mission Control, staffed by sane and non-murderous humans, is still there for Bowman and he finds out exactly what went wrong with Hal and why. This is cold comfort to Bowman, who's over an hour away by radio (the Solar System is a big place, even at light speed) and more alone than anyone has ever been. And in the end, all Mission Control can do is sit there while he utters his Famous Last Words (which oddly enough you ''don't'' get to hear him say in the original film -- though they ''are'' the ColdOpen for the sequel). [[spoiler:"My God - it's full of stars!"]] And it is. Literally.
* TheMonolith: {{Trope Maker|s}}.
* MoodMotif
* MoreThanThreeDimensions: The novelization explicates that the Monolith has sides in a proportion of 1:4:9, the squares of the first three integers. Then it suggests the Monolith extends in more dimensions, presumably by squares.
--> "And how naive to have imagined that the series ended at this point, in only three dimensions!"
* MundaneDogmatic: The film averts SpaceIsNoisy and space stations use CentrifugalGravity rather than ArtificialGravity. Aliens are never seen, and it is left ambiguous whether the events following David Bowman's encounter with the monolith (which would require FTL travel) are literally happening or are all just in his head. (Interestingly, this ambiguity allows the film adaptation to meet the Manifesto while the book by Creator/ArthurCClarke did not.)
* MundaneMadeAwesome: Inverted. Space travel looks awesome to ''us'', the audience, but to Floyd, Bowman and Poole it's routine and boring.
* MurderIsTheBestSolution: For HAL, as a way out of the LogicBomb he becomes trapped in.
* NarrativeFiligree: Many scenes, especially the middle. The subplot with HAL, which is the most memorable part of the movie, serves only to leave Bowman as the SoleSurvivor, and it doesn't really have any connection to the Monolith plot except as a consequence of the GovernmentConspiracy.
* NiceJobBreakingItHero: Frank and Dave use the pod to speak privately from HAL. Good. They then have HAL rotate the pod so HAL can watch them talking through the window, not realizing that HAL can read lips.
* NoNewFashionsInTheFuture: This is most obvious with the very [[TheSixties '60s]]-looking women's hairstyles, and the matching plaid suit and pants worn by the photographer at the moon base.
* NonMaliciousMonster:
** The leopard in the "Dawn of Man" segment. It's not even really a monster, just an ordinary animal doing what it has to do to survive, but because the protagonists are apes, it's the segment's "villain".
** HAL 9000 in the "2001" segment. While it's ambiguous whether or not he's sentient, his psychotic behaviour wasn't his fault, being caused by a LogicBomb in his programming.
* NobodyPoops: Averted by Floyd when he is careful to read through the entire set of instructions for the Zero Gravity Toilet before he uses it.
* NotSoStoic: The astronauts tend to maintain calm and professional even in crisis situations. However, when [[spoiler: HAL refuses to let him back through the pod bay doors or continue the conversation]] Dave's composure briefly wavers. And later [[spoiler: when he is deactivating HAL]], he is audibly breathing heavily, most likely from fear. And that's ''before'' he enters [[spoiler: [[GoMadFromTheRevelation the stargate]]... ]]
* NothingIsScarier: With the introduction of the featureless black monoliths and the incredibly eerie music accompanying them.
* ObliviouslyEvil: HAL 9000. While not directly explained in Kubrick's movie, the novel and [[Film/TwoThousandTenTheYearWeMakeContact sequel]] elaborate that he was programmed to be both completely truthful and keep the crew from the motivations behind the flight to Jupiter -- and when the crew becomes inquisitive, [[TakeAThirdOption he has to find a way to fulfill both]].
* OffscreenMomentOfAwesome: In the film when Bowman exits the stargate the pod just appears inside the alien-built hotel room. In the book he emerges back into regular space, sees a red giant star surrounded by thousands of abandoned alien space ships (from other races who had been uplifted by the monolith aliens and found their way there). He flies closer to the star and the hotel room is assembled around his pod. The cost of filming this scene using 1960s special effects technology would've been astronomical, so they never even tried.
* OffscreenRealityWarp: This provides much of the MindScrew in the hotel room scene at the end of the movie. Bowman is in the pod, then he sees a slightly older version of himself in his spacesuit outside the pod, then the pod disappears. From the bathroom, he sees an older version of himself having dinner, then when the middle-aged Bowman gets up to look in the bathroom, the spacesuited Bowman has disappeared. The middle-aged Bowman sees an even older version of himself in the bed, then he and the dining table have been replaced by the Monolith. It conveys the effect of time dilation well, as if Bowman's entire life in that hotel existed simultaneously in one space.
* OffscreenTeleportation: Used memorably for the appearances of the Monolith and to show the progression of Dave Bowman's age in the hotel room near the end of the movie.
* OhCrap: David Bowman as he is taken Beyond the Infinite.
** Dave gets ''three'' Oh Crap's in a row in the space of about a minute.... First, [[spoiler:[[AC:"I know you and Frank were planning to disconnect me."]]]] He tries to bluff, but then [[spoiler:Hal answers, [[AC:"Although you took very thorough precautions in the pod against my hearing you, I could see your lips move."]]]] Finally, the look on Dave's face when he realizes that [[spoiler:he forgot his helmet.]]
** [[AC:"Dave, this conversation can serve no purpose any more. Goodbye."]]
** HAL gets one of his own. [[AC:"My mind is going... I'm afraid..."]]
* OminousLatinChanting: György Ligeti's "Requiem" and "Lux Aeterna" are ''so'' ominous, you can't even tell they're in Latin anymore. (Or Greek, in the case of the Kyrie from the "Requiem"!)
* OneEyedShot: During the Star Gate sequence, there are several extreme close-up shots of Bowman's eye with solarized colors. The colors of the eye only return to normal when the pod arrives in the hotel room. The image is featured on [[https://www.cinemasterpieces.com/aapics09/2001aug09.jpg this movie poster]].
* OohMeAccentsSlipping: Poole's father in the video letter.
* OurGraphicsWillSuckInTheFuture: Averted (a bit). The film used modified cel animation to depict computer readouts that would otherwise be difficult or impossible in 1968, such as David Bowman watching television on a paper-thin tablet aboard the ''Discovery''. On the other hand, the Soviet ''Alexei Leonov'' isn't nearly as advanced as the American ''Discovery'' despite the ''Leonov'' being several years younger.
* {{Panspermia}}: The aliens didn't necessarily seed Earth, but most definitely influenced the evolution of mankind.
* PartingFromConsciousnessWords: [[PlayingWithATrope Played with]]. HAL is effectively dead for the remainder of the movie, but is only shut down, as he's a computer. It's one of the most famous moments in film
-->'''HAL''': "Daisy, Daisy, give me your answer do..."
* PickYourHumanHalf: HAL 9000 (rather subtly), the psychotic ship's computer.
* PietaPlagiarism: Dave is holding Frank Poole's body this way--using the arms of the EVA pod--during the "pod bay doors" sequence.
* {{Precursors}}: The Firstborn, the creators of the Monolith.
* {{Pride}}: See Foreshadowing above.
-->'''Dave Bowman:''' Another thing just occurred to me: As far as I know, no 9000 computer's ever been disconnected.\\
'''Frank Poole:''' No 9000 computer's ever fouled up before.\\
'''Bowman:''' That's not what I mean. I'm not so sure what he'll think of it.
* ProductPlacement: Some, like Pan Am and the AT&T Bell System, are [[{{Zeerust}} hilariously dated]].
* PublicDomainSoundtrack: There was a soundtrack by Alex North in the works for the movie, but until it was ready they used the classical music as a placeholder. Kubrick ended up liking the classical music version so much he never used North's compositions.
* QuieterThanSilence: Used all the time, and in many scary parts.
* ReadingLips: Despite all of Bowman's precautions, he can't keep HAL from eavesdropping on his chat with Poole.
* ARealManIsAKiller: Literally evoked in a biological sense; the dawn of man is marked by the ape becoming a hunter. Killing a former fellow-creature is the [[EstablishingCharacterMoment defining moment]] of the new species.
* RealSongThemeTune: The film uses a climactic fanfare that comes from Richard Strauss's "Also Sprach Zarathustra", written in 1896. The work wasn't that popular in the English-speaking world at the time, so it's understandable that many viewers assume it was written especially for the movie.
* RealityIsUnrealistic:
** The original plan was to have Discovery fly to Saturn. To that end, Kubrick's special effects team tried to create a model of Saturn that was as realistic as possible. However, the more realistic they made it, the faker it looked! The rings looked like a flat band of metal foil held up by plexiglass. Thus, the trip to Saturn was scrapped in favor of a trip to Jupiter. Flash forward a decade-and-a-half, when Voyager 1 sent back close-up RealLife photos of Saturn and its rings the rings in Voyager's photos looked exactly like the flat, "fake" ones that Kubrick's production team had abandoned!
** Also, the Discovery was originally designed with large radiator fins, which is indeed realistic because spacecraft need a way to dissipate excess heat from the engines, life support, electronics, etc. However the production team chose to omit the fins because they looked too much like wings, and they didn't want audience members to think that the Discovery was intended for atmospheric flight.
* RecurringCameraShot: As the Monolith is jumpstarting human development it is shown with the sun right behind its top edge and the moon above that. Later when the one on the moon sends its signal the shot is seen again, the sun over its top edge and the earth this time above that.
* RedEyesTakeWarning: The cameras HAL looks through have glowing red lenses.
* ReflectiveEyes: There are a couple of shots where one of the astronauts is reflected in HAL's red eye.
* RefrainFromAssuming: "Daisy Bell" is the song HAL sang (or rather, covered), not "Daisy, Daisy" or "Bicycle Built for Two". It was the first computer synthesized tune, in 1961.
* RidiculousFutureInflation:
** Inverted, Floyd makes a video telephone call (via AT&T, no less) from a pay phone on the space station to earth, using his credit card, talks to his daughter in what we would now call High Definition video for about 2 minutes, and the listed call charge is exactly $1.70. (Today, if you used a public pay phone to make a call--presuming you could find a pay phone--The price in numbers (for a voice call) would be about the same, except the decimal point would be one space to the right...)
** Again, the novel describes a moon administrator's office as having "all the fittings and status symbols of the typical '''$50,000 a year''' head of a department."
* RidiculouslyHumanRobots: {{Discussed|Trope}} in the segment where the crew, and HAL himself, are being asked about his emotional capacity.
* RingWorldPlanet: The space station.
* TheRival: The rival group of man-apes that antagonizes the main group. They are referred to as "the Others" in the novel.
* SapientShip: HAL, while not the ship but its controlling computer.
* SceneryPorn: Spacecraft in orbit around the Earth, waltzing to the Blue Danube. Too awesome to describe...
* SealedOrders: HAL's sealed orders, and the anxiety over having to lie, are what causes him to go psychotic and murder the crew.
* SealedRoomInTheMiddleOfNowhere: The hotel room has no windows or exits. In the novel, it was specifically a sealed room in the middle of a ''red giant star''.
* SeanConneryIsAboutToShootYou: HAL Is About to Launch a Maintenance Pod Right at You.
* ShaggyDogStory: When Bowman goes out to rescue Poole, the entire sequence is shown in real time in order to make it absolutely clear that there's no way Poole could survive that long without air. HAL takes advantage of Bowman's absence to kill the other crew members by CryonicsFailure. Bowman recovers Poole's body, but ends up having to release him back into space in order to get back onto the ship.
* ShinyLookingSpaceships: ''Painfully'' shiny at times.
* ShoutOut:
** During HAL's death scene, he sings a brief snatch of the song "Daisy Bell" ([[AC:"Daisy, Daisy, give me your answer do..."]]); this was chosen because Arthur C. Clarke had, a few years previous, visited [[http://www.youtube.com/watch?v=41U78QP8nBk a Bell Labs demonstration]] of synthesized speech, which included singing the song in question, and was the first example ever of computer speech. This ShoutOut is itself a frequent source of shout-outs in other films.
** A wheel-shaped space station and an interplanetary mission jeopardized by SpaceMadness were previously seen in George Pal's ''Conquest of Space'', released in 1955.
** ''Literature/TheOdyssey'', of course. HAL was even originally going to be named Athena, after Odysseus's patron goddess, and the protagonist being named ''Bowman'' may be a reference to Odysseus owning a bow only he was strong enough to string. Also see SoleSurvivor.
** In a 1969 interview, Kubrick specifically mentions the influence of UsefulNotes/CarlJung on the monolith design. In fact, the entire "Beyond the Infinite" sequence is similar to a section of UsefulNotes/CarlJung's autobiography, ''Memories, Dreams, Reflections'', in which Jung dreams he is floating above Earth when a black monolith appears. He enters it, finding an entire Hindu temple, and undergoes a spiritual evolution.
* ShowDontTell: This is why the novel works so well as a companion piece. Whereas the film has astonishing visuals, the story is deliberately vague. The novel obviously can't show any visuals, so Clarke devotes a lot of time to explaining the backstory, the history of the technology in the film, and what's really happening with the prehistoric humans and [[spoiler:Bowman after he enters the Star Gate]].
* ShownTheirWork: Clarke and Kubrick made the same effort in regards to space travel and general scientific accuracy, even though the atomic-powered spaceship does not have radiator fins to get rid of the reactor's waste heat. The makers intentionally left them off, because after a decade teaching the public that there is no air in space, they didn't want them wondering why the spacecraft has wings.
* SilenceIsGolden: Long stretches of the film have no dialogue, including the first 22 and last 24 minutes (not counting the overture and end credits/exit music).
* TheSingularity: The monoliths are machines left behind by a race of aliens that underwent one of these.
* SinisterGeometry: The monoliths, featuring the arc numbers of 1, 4, and 9; 1:4:9 being the ratio of the monolith's depth to width to height, the squares of the first three positive integers. [[AlienGeometries "And how naive to have imagined that the series ended at this point, in only three dimensions!"]] The films and some of the cover art mess up the dimensions.
* SleeperStarship: There were three more astronauts aboard the ''Discovery One'' in cold sleep, HAL killed them.
* SlidingScaleOfGenderInequality: This is a very male-dominated movie. We do see women working in space, though largely as stewardesses, secretaries, and other stereotypically female professions. Dr. Floyd does speak to two female scientists, but the group conducting the lunar expedition as well as the Discovery crew are both made up entirely of men. Arthur C. Clarke's sequel novels, especially ''2010: Odyssey Two'', incorporate more strong female characters.
* SlidingScaleOfRobotIntelligence: A substantial amount of time is spent in discussions over the intelligence and emotional capacity of the H.A.L. 9000 computer that runs the spaceship USS Discovery. It's generally agreed that HAL is of human-level intelligence, but while he has vastly superior powers of calculation (obviously), his emotional capacity and intellectual maturity are those of a child. This factors heavily into the explanation of the Logic Bomb that causes him to turn on the crew.
* SlidingScaleOfVisualsVersusDialogue:
* SmartPeoplePlayChess: HAL-9000 demonstrates its superior intellect early on by beating Poole in a game of chess. Since HAL [[http://www.visual-memory.co.uk/amk/doc/0095.html errs reporting a move]] and Kubrick was a talented and knowledgeable player, the scene may be subtly {{foreshadowing}} HAL's deception or inaccuracy.
** The novel states that HAL deliberately loses against the human players 50% of the time so that they would find him a challenging opponent as opposed to frustratingly perfect and unbeatable. The crew are of course smart enough to know that this is the case but everyone involved decide to keep up the pretence for the sake of everybody's happiness.
** Interestingly, HAL appears to bluff Poole into surrendering, as well as read his lips as he mouths his next several moves.
* SocialServicesDoesNotExist: For HAL. Despite the magnitude of the mission, evidently this computer is not programmed to go into any sort of safe mode when conflicts pop up in its programming, ''nor'' are logs of his thoughts being beamed back to Earth to be reviewed, ''nor'' is there a teeny stripped down separate AI "subconscious" watching his thoughts and alerting Earth in case of problems, ''nor'' is there an automatic "kill switch" for Dave or Frank to use to cut off HAL's higher functions in case of trouble.
* SocietyMarchesOn:
** Pan Am flies spaceships to the Moon. Ma Bell provides the telephone service. All in 2001.
*** Every single company that had a product or brand placement in the movie has since [[EverybodysDeadDave gone out of business]], in fact.
** The Pan Am flight crews are all men, [[StayInTheKitchen and the flight attendants are all women]]. The alternatives wouldn't have occurred to most people in 1968.
** The attendant on the security video-screen asks new arrivals for their ''Christian'' name (today it's called first name or given name).
* SoftSpokenSadist: HAL 9000 has this, overlapping with CreepyMonotone.
* SoleSurvivor: Like [[Literature/TheOdyssey Odysseus]], Bowman is the only member of his crew to return home, but [[YouCantGoHomeAgain transformed by the experience]].
* SomeDexterityRequired: After extended sequences depicting the reduction of space travel to mundane actions and everyday situations, Dr. Heywood Floyd encounters an enormously long set of instructions for operation of the "Space Toilet".
* SoundOnlyDeath: The hibernating astronauts who are murdered by HAL. Our only indication that they are dying comes from their life sign monitors, which flatline in a chorus of alarming beeps.
* SoundtrackDissonance: HAL sings "Daisy Bell" as it dies.
* SpaceClothes: A more realistic version. Though early on we see Dr. Floyd travelling through space in a casual suit as well as a few people on the space station dressed similarly, the Stewardesses are seen wearing a strange white suit which includes a round hat and magnetic shoes; it looks odd but the design is somewhat practical (the shoes are designed so they can walk down aisles in zero-gravity, while the hats are probably to keep their hair from floating all over the place). However, on board ''Discovery'', Dave and Frank are simply wearing gray jumpsuits like you'd expect from real astronauts.
* SpaceIsNoisy: An all-too-rare aversion, which arguably adds to the creepiness of certain scenes, such as when Bowman is attempting to reenter ''Discovery'' via the airlock.
** Played straight when apparently noise can be heard during the "Beyond the Infinite" sequence, although it's an open question if it actually occurs in the vacuum of space.
* SpaceIsSlowMotion: Practically the TropeCodifier.
* SpacePeople: It is revealed that children born on the moon will grow fast on its low gravity, but won't age quickly and will live longer. As shown when Frank Poole met his colleague Dr. Halvorsen's daughter who's only 4 years old yet she's grown, the last time he saw her she was a baby.
-->So here, Floyd told himself, is the first generation of the Spaceborn; there would be more of them in the years to come.
* SpaceStation: The "rotating orbital wheel"-styled Space Station V (Five). Perhaps the most-recognizable in fiction.
* SpaceSuitsAreScubaGear: The space suits have an attached air line, which Frank frantically tries to reattach as he drifts off into space.
* SpheroidDropship: The Aries series of orbit-to-Moon shuttles are Spheroid Spaceliners.
* {{Squick}}: The novel describes how the man-apes pulled the leopard's tail out by the roots.
* StaggeredZoom: Into HAL's camera on the front of the space pod that he kills Frank with.
* StandardEstablishingSpaceshipShot: The UrExample.
* StarfishAliens: The aliens are so alien that they can't even be shown on screen. The novels imply that they started as StarfishAliens, but later transformed themselves into MechanicalLifeforms, and eventually into EnergyBeings. Clarke felt like showing the aliens would inevitably diminish their impact; in a supplementary book called ''Lost Worlds of 2001'', he records failed experiments with writing about both HumanAliens and worlds filled with StarfishAliens, before he finally decided to have the monoliths be the last relics of an unseen, long ago vanished civilization.
* StarterVillain: The leopard is an odd example as it never encounters the main protagonist. Rather, it serves as this to ''humanity''; while not evil, it's the biggest threat to the apes destined to become the ancestors of mankind at the beginning. Then the Monolith teaches apes how to make tools, and their next confrontation [[CurbStompBattle goes quite differently.]]
* StayInTheKitchen: Pan Am offers passenger service to low Earth orbit and the Moon, but the flight crews are all men and the flight attendants are all women (which was the case in the commercial airline industry in 1968, when the movie was made.)
* StayWithTheAliens: Spelled out in rather greater detail in the novel; the whole point of the Monolith setup is to "capture" the first human who makes it out that far into space.
* StockShoutOuts: One of the poster children. The sunrise sequence, HAL's voice and red eye, the bone/satelite MatchCut... you can reference literally ''anything'' in this movie and every viewer will instantly get it.
* StreamingStars: Within the hyperspace gate, the psychedelic colors are intended to represent the incredible speed of Bowman's travel.
* StupidityInducingAttack: Dave Bowman pulls a rare lethal version on HAL 9000, removing its memory modules until its "brain" shuts down. Despite the machine being a clear antagonist, the sequence is remarkably upsetting.
-->'''HAL:''' Dave. My mind is going. I can feel it. I can feel it. My mind is going. There is no question about it. I can feel it. I can feel it. I can feel it. I'm a...fraid. Good afternoon, gentlemen. I am a HAL 9000 computer...
* SufficientlyAdvancedAliens: Whoever the Monolith's creators are.
* SurpriseCheckmate: HAL does the "number of forced moves" version. Notably, it was cheating and not all of them were really forced.
* SuspiciouslyAproposMusic: ''"I'm half crazy all for the love of you..."''
* TastesLikeChicken: The crew flying to Tycho Crater remark this of the sandwitches they are eating.
* TechnologyPorn: The film is pretty much a 50/50 mix of this and SceneryPorn.
* ThrownOutTheAirlock: What HAL tries to do to Dave.
* TheyShouldHaveSentAPoet:
** The Star Child sequence.
** In an out-take from the novel, they did--Bowman is reciting lines from ''Childe Harold'' as he approaches the Monolith.
* ThisIsGonnaSuck: Bowman doesn't actually say it, but it's written all over his face right before [[spoiler:he blows the pod's hatch, sans helmet]].
* ThrownOutTheAirlock: HAL 9000 kills Frank Poole by maneuvering his space pod and using the gripper arms while he is on EVA to replace the AE-35 unit. David Bowman rushes out in another pod to rescue his fellow astronaut, but in his haste neglects to take a helmet for his pressure suit. When HAL refuses to open the pod bay doors so Bowman can reenter Discovery, Since Bowman lacks a helmet, he has to throw himself out of the airlock in order to regain entry into the spaceship. He is able to open the outer door of the airlock with the gripper arms, but the pod hatch does not mate with the door completely. Bowman blows the explosive bolts on the hatch, tucks down and is blown into the airlock. In seconds, he is able to shut the outer door manually and repressurize the airlock. Although this scene is perfectly plausible, despite Explosive Decompression, Bowman inhales and holds his breath right before the hatch blows, which is the wrong thing to do. This may have been a mistake by actor Keir Dullea, however. Arthur C. Clarke reportedly said that if he had been on the set that day, he would have corrected this.
* ToiletHumor: See NobodyPoops. The film's only intentional joke.
* TooDumbToLive: In the novel, the rival group of man-apes paralyzed with fear upon seeing Moon-Watcher held the leopard's severed head towards them. Except for One-Ear, who went to attack him anyway, only to get bashed on the head by the leopard's head.
* TouchedByVorlons: David Bowman gets captured by SufficientlyAdvancedAliens, who cause him to Ascend to a Higher Plane of Existence. He returns to Earth many years later as the Star Child, an EnergyBeing with superpowers.
* TreacherousAdvisor: HAL 9000 is supposed to be omniscient guide for the rest of the Discovery crew, but after Frank Poole's death it is clear he no longer wants Dave alive.
* TrippyFinaleSyndrome: Perhaps the patron saint of this trope.
* TwentyMinutesIntoTheFuture: Or so it seemed in 1968.
* TypesetInTheFuture: HAL is the UrExample of using Eurostile Bold Extended on computer screens to indicate a futuristic setting. The zero-gravity toilet instructions are set in Eurostile Bold, but most other signs and control panel markings (such as "Caution Explosive Bolts") are in Futura Bold, the standard font Boeing uses on the control panels of its aircraft.
* {{Ubermensch}}: If one follows the Nietzschean line of interpretation (which is backed up as a legitimate strand by WordOfGod) to understand the meaning of the film, the Star Child is a visual metaphor for the birth of the Übermensch.
* UncannyValley: [[InvokedTrope Invoked]], despite being an UnbuiltTrope at the time. See CreepyMonotone above.
* TheUnreveal: We never see any aliens. All we know of them are their tools, the Monoliths. This was due to the suggestion from Creator/CarlSagan that they could never genuinely conceive of an alien lifeform without it looking like a puppet or a bad rubber mask.
* UpgradeArtifact: The monolith is the ultimate one, it kickstarts or triggers evolutionary levels.
* VaderBreath: Prominently featured during spacewalk scenes, reportedly performed by Kubrick himself.
* VideoPhone: The movie features a videophone in a phone booth, in a rotating space station. The AT&T Picturephone had been publicly demonstrated in 1967, the year before the film's release. It never caught on.
* VillainousBreakdown: HAL's pleas to Bowman become increasingly desperate as he realizes that he's about to be "killed" and has no way to prevent it. "I'm afraid, Dave."
* TheWalrusWasPaul:
-->'''Arthur C. Clarke:''' If you understood ''2001'' completely, we failed. We wanted to raise more questions than we answered.
* WellIntentionedExtremist: HAL 9000 is only devoted to the mission at hand, and believes that Dave and Frank will jeopardize the mission by disconnecting HAL after lip-reading from them that they intend to do so if the AE-35 component does not fail as HAL has predicted. It turns out this was do to a Logic Bomb: he had been told to lie about the nature of the mission, which conflicted with his programming of providing clear and accessible information, which triggered his breakdown.
* WhamLine: "I'm sorry, Dave. [[AIIsACrapshoot I'm afraid I can't do that.]]"
** From the book: "[[spoiler:The thing's hollow! It goes on forever, and...oh My God, it's full of stars!]]"
* WhamShot: The camera showing [[spoiler:HAL can read lips]], and then immediately cutting to {{Intermission}}.
** Also, a double Wham Shot in the ending; [[spoiler:the appearance of the Monolith in the hotel]] and [[spoiler:David Bowman, being replaced by a space baby within light]].
* TheWorldIsNotReady: The justification for the GovernmentConspiracy --
-->'''Floyd:''' [[AsYouKnow I'm sure you're all aware]] of the extremely grave potential for cultural shock and social disorientation contained in this present situation... if the facts were prematurely and suddenly made public without adequate preparation and conditioning.
* {{Zeerust}}: HAL is a mind-bogglingly advanced, sentient computer, but can't print plain text onto looseleaf paper. Humanity in 2001 can build spectacular space-stations and has mastered interplanetary flight, but people are still using typewriters.[[note]]Some people still do; manual ones don't require electricity and can be taken anywhere.[[/note]] By 2001, the movie looks more like what the world would have been like with 1960s styles coinciding with a future space age.
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