[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/down23_7236.jpg]]
[[caption-width-right:300:Because parking garages aren't baffling enough already.]]

->''"See, the apple's not giant. It's just in the foreground."''
-->-- '''Marzipan''', ''WebAnimation/HomestarRunner''

Depth Deception is what happens when depth perception goes wrong.

Sometimes, often due to uncommon conditions such as viewing through a telescope, camera or other similar optical device, people can get confused and mistake something small and close (such as an insect) for something far and huge (such as an [[AttackOfTheFiftyFootWhatever Attacking 50 Foot Whatever ]]). Or vice versa. For reasons closely related to the RuleOfFunny, this happens more often in fiction than in RealLife, though TruthInTelevision cases are not unheard of.

A specific subtrope is BigLittleMan, where a character is introduced as being much bigger or smaller than they really are.

Compare ThatsNoMoon, where a large object is mistaken for an equally large but more mundane object. See also PerspectiveMagic, where this can be used to manipulate reality.

When it's used intentionally as a camera technique -- one of the oldest special effects on record -- it's called ForcedPerspective.

Not to be confused with DepthPerplexion.
----
!!Examples

[[foldercontrol]]

[[folder:Advertising]]
* Tricks such as the one in the page image are used extensively to paint two-dimensional advertising logos onto horizontal planes such as cricket pitches, football grounds, baseball fields, etc. When viewed from the most-commonly used camera, the logos appear as they would if printed on a vertical billboard. When viewed from one of the other cameras, however, they look very weird indeed.
[[/folder]]

[[folder:Anime & Manga]]
* Las Noches from ''Manga/{{Bleach}}''. Ichigo and company thought it was close enough to run to... and after they were forced to stop to catch their breath, it still looked as far away as ever. When they finally arrived, it would have taken them ''three days'' to walk around to the nearest entrance. You can't really blame them for making their own in that case.
* ''Manga/GAGeijutsukaArtDesignClass'' mentions this concept in one episode, using the more proper term "trompe l'oeil".
* The ''Anime/GundamSEEDCharacterTheater'' does this with Torii, Kira's robot bird, which here is about the size of a small car (as Shinn, Rey, and Luna learn the hard way).
* It happened early in ''Manga/OnePiece'', when the crew sailed in a sea populated with huge creatures. They saw a dolphin coming after their ship... but it was huge, and looked normal just because it was at a great distance from them.
* In an episode of ''Anime/{{Pokemon}}'', what Team Rocket thought was Ash's Pikachu wandering towards them turned out to be a gigantic robotic Pikachu that was approaching from farther away. "It's Big-achu!"
[[/folder]]

[[folder:Comic Books]]
* In the ''{{Tintin}}'' book ''The Shooting Star'', when Tintin looks into the telescope first he sees what appears to be a GiantSpider rather than the huge blazing meteorite which was partly obscured by a spider crawling across the telescope lens.
* Blunt Trauma is attacking Comicbook/{{Empowered}}! No, it was just his action figure Ninjette threw into the air to train Emp.
* A CrowningMomentOfFunny from the Italian comic ''{{Sturmtruppen}}'', as the sergeant is training the desert troops:
-->'''Sergeant:''' You'll have to learn how to estimate distances. You! How far is dat palm on the horizon?\\
'''Recruit:''' I'd zay about a couple of meterz, Sergeant.\\
'''Sergeant:''' ''Idiot!'' Appearences in the desert are deceiving! Now think: how far can be that tiny palm on the horizon?\\
'''Recruit:''' ''(pulls out a meter and measures the distance to the palm, that turns out to be inches high and just on top of the nearest dune)'' Two meters and 15 centimeters, Sergeant!
* In an issue of ''[[ComicBook/RobinSeries Robin]]'', where Robin, Catwoman and the Psyba Rats are all investigating a house built by a rich practical joker, the Psyba Rats notice something odd about one hallway:
-->'''Hacker''': It's a ''forced perspective illusion''!
-->'''Razorsharp''': Really? Because I thought we were actually getting larger.
[[/folder]]

[[folder:Comic Strips]]
* In a ''ComicStrip/FoxTrot'' strip, Jason makes a snow sculpture that despite being about an adult person's size, when seen from the front looks like a towering snowman giant getting ready to stomp. Jason remarks that "ForcedPerspective is an underrated art form."
* Calvin of ''ComicStrip/CalvinAndHobbes'' used this to surprise his father once; by making the top half of a snowman's head and a few "fingers", he made it look like a giant snowman was peering over a hill at him.
[[/folder]]

[[folder:Fan Works]]
* The ''TabletopGame/CallOfCthulhu 2005'' FanFilm used this to portray the AlienGeometries of Ry'leh. At one point, a man falls into a hole which appeared to be a protruding rock thanks to this.
[[/folder]]

[[folder:Films -- Animation]]
* The whale from ''WesternAnimation/FindingNemo''. "''I'm'' the little guy..."
* ''Disney/TheLittleMermaid'': Scuttle sees Ariel through a spyglass from the wrong end, and shouts to her as if she were far away, even though she is actually a few inches in front of him. When she moves the spyglass away, Scuttle exclaims, "Whoa, what a swim!"
[[/folder]]

[[folder:Films -- Live-Action]]
* Used as a gag in the movie ''Film/TopSecret''. A ringing phone seems to be really close to the camera, until a man picks up the three-foot receiver. The scene evokes classic Hitchcock, who was a fan of this trope but for less comedic reasons.
* ''Film/CitizenKane'' used this subtly:
** In one scene, a window turns out to both be ''much'' larger and ''much'' higher up than it initially appears, which means that when Kane approaches it, he suddenly appears a lot smaller and less significant. This, of course, is used for symbolic effect.
** Also done with the fireplace in Xanadu, which is revealed to be large enough to burn whole trees when Kane goes back to it.
* There is a Olsen Twins's film where they parody this when they visit a little person house, at first when they see it and mention how little it looks, the guy with them says that the house is actually far away.
* In ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull'', IndianaJones misjudges a heroic rope swing onto a moving jeep, missing it, before he says the line below. This, his being fooled by the optical illusion in ''The Last Crusade'', and his older self being depicted with an eye patch, have led to some fans believing one of his eyes is going bad.
-->'''Indy:''' Damn! I thought that was closer..."
* In ''Film/RobinHoodPrinceOfThieves'', Azeem the Moor shows Robin the approaching riders through his telescope. Unfamiliar with this technology, Robin starts swinging his sword at the suddenly-close enemies.
-->'''Azeem:''' [[WhatAnIdiot How did your uneducated kind ever take Jerusalem?]]
* ''Film/{{Labyrinth}}'' did this with some pieces of scenery that turned out to actually be made up of multiple objects.
* The opening hallway that leads to the edible room in ''WillyWonkaAndTheChocolateFactory'' is far shorter than it actually appears; the hallway gets smaller and smaller to the end.
* A dramatic (and ''extremely'' suspenseful) example appears in ''RoadToPerdition'': A young boy walks up to the front door of his home and sees Connor, the son of the mob boss who employs his father, approaching [[spoiler:having just killed the boy's mother and brother]]. Connor appears to stare directly at him through the door's window, but it turns out [[spoiler:Connor was actually looking at his own reflection.]] After the boy realizes this, he has time to hide before Connor leaves the house.
[[/folder]]

[[folder:Literature]]
* EdgarAllanPoe's short story "The Sphinx" is about a man seeing a terrifying monster walking on the hill outside the cottage where he's staying. It turns out at the end that it was an insect crawling on a spider web very close to his face.
* Creator/GKChesterton references the trope in the ''Literature/FatherBrown'' story "The Song of the Flying Fish":
-->"A thing can sometimes be too close to be seen, as, for instance, a man cannot see himself. There was a man who had a fly in his eye when he looked through the telescope, and he discovered that there was a most incredible dragon in the moon."
* A short story about a monstrous dragon on a distant mountain. But in actuality, the dragon always ''appeared'' to be the same size no matter how far away the viewer was, so when the protagonist climbed the mountain he found the dragon to be much smaller.
[[/folder]]

[[folder:Live-Action TV]]
* A hilarious incident in ''Series/ArrestedDevelopment'' involving some Japanese investors, as well as [[spoiler:a jet pack and a rat suit]].
* [[{{Cloudcuckoolander}} Dougal]] from ''FatherTed'' apparently can't tell the difference between small toy cows and real ones which are far away.
-->"Now concentrate this time, Dougal. These ''(holds up model cows)'' are small, but the ones out there ''(points outside)'' are '''far away'''."
* ''Series/DoctorWho''
** The Doctor once explained that the [[BiggerOnTheInside TARDIS]] works by neatly subverting this trope. Two identical boxes are put side-by-side to show they're the same size. Move one farther away. Which one's bigger? Well, neither, they're still the same size. But what if you could make it so that the relative dimensions in space were actual?
** In a more recent episode, Donna Noble sees a wasp hovering just outside the window, only it turns out to be a huge wasp far away but approaching very fast.
* Like ''Film/TopSecret'' above, in ''ParkerLewisCantLose'', a character dealing with the stresses of his job, hears the phone ringing with the phone positioned cinematically in the foreground taking up most of the shot. As he comes up to it and picks it up and we zoom out, it turns out the phone is gigantic with the receiver as long as his forearm.
* Some of the Creator/AdultSwim AdBumpers feature "fake miniature" photography, described below in [[foldercontrol]]

[[folder: Real Life ]]
.
* ''PhoenixNights'' featured bouncer Max squinting at an approaching group of dwarfs and asking the immortal question, "How far away are they?"
* An opening segment of ''MalcolmInTheMiddle'' had the idiotic older brother Reese crying in triumph that he has the much, much bigger popsicle than what Malcolm has from his perspective. Malcolm pulls his popsicle next to his to reveal it's the same size.
* On ''{{QI}}'', David Mitchell tried to get a joke on this concerning giant tortoises (no one gave them scientific names because they looked at them from the wrong angle and assumed they were normal-size tortoises). He stumbled over the delivery, as he suddenly realised "they thought they were normal tortoises, but closer" wouldn't work in reality, and got through it only with coaching from Stephen Fry -- though that was funny too.
* ''ABitOfFryAndLaurie'' has a VoxPops segment where a man says his first impression of his wife was that she was an incredibly tiny woman, and that it wasn't until weeks later, after he'd gotten to know her, that he realized she was actually just far away.
* In "Magical Mysteries", the ''SaturdayNightLive'' parody of the Music/InsaneClownPosse song "Miracles", one of the mysteries is: "Are children small, or just far away?"
* ''{{Series/Sherlock}}'' episode "The Empty Hearse" depicts Sherlock and Mycroft apparently [[SmartPeoplePlayChess playing chess]], though never actually handling the pieces -- because the chessboard is in fact between the camera and the game of ''Operation'' they're really playing.
[[/folder]]

[[folder:StandUpComedy]]
* An auditory version is referenced by TimVine in one of his more surreal moments.
-->I thought to myself, "Is that dog getting closer, or is he just barking more loudly?"
-->It turned out to be both, so he arrived before I expected.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/SuperSmashBros Brawl: The Subspace Emissary'': In the cutscene introducing [[{{VideoGame/Pikmin}} Captain Olimar]] and [[{{VideoGame/F-Zero}} Captain Falcon]], the ROB Olimar is fighting made to be huge so that it seems the Captain and his Pikmin are still only an inch tall. Then Captain Falcon shows up then punches out the giant robot.
* In ''KingdomOfLoathing'', before the Observatory was destroyed, it was possible to look through the telescope and discover "a giant space mosquito".
* In ''SuperMario64'', the room where you can enter Tiny Huge Island is a T-junction with a painting at the end of each hall, all of which ''appear'' to be the same size when you first enter: the one in the center is normal-sized and non-functional, the one on the left is actually slightly ''smaller'' than usual, and the one on the right is ''gigantic''. The two paintings that actually warp Mario are also set in hallways that use forced perspective, meaning that until you start walking toward one, the images all look the same size. Which is actually quite jarring when first seen. Walk towards the small one and it's MUCH closer to you than it should be, with the hall way going inwards. Walk towards the large one and you're gonna be walking a looooooooooong time.
** ''SuperMario3DLand'' encourages the use of the 3D effect in some sections. Without the 3D effect, forced perspective causes a block that appears to be part of the background may be in the foreground. There are subtle differences, but at first glance, you won't see it.
* A few of the off-path rooms in ''[[LegoAdaptationGame LEGO Star Wars II]]'' appear "correct" from certain angles, but are revealed to be skewed when you actually walk into them. For instance, the very first [[RobotBuddy Protocol droid]] door in the very first level; a few gimmick objects are included to help sell the illusion.
* One dungeon in ''VideoGame/ShinMegamiTenseiIIINocturne'' has several fake hallways that are actually painted walls. You will often reach a junction where you need to choose between the real hallway and a wall. If you choose the wall you are booted to the beginning.
* The third chapter of ''TalesOfMonkeyIsland'' uses this trope to reveal the true size of [[spoiler:La Esponja Grande]].
* [[http://www.pixiv.net/member_illust.php?mode=medium&illust_id=6756117 You will never look at]] [[Franchise/{{Pokemon}} Gardevoir]] the same way.
* In ''VideoGame/{{Klonoa}} 2: Lunatea's Veil'', in the Haunted House section of Joilant, there's a room with a straight path lined with ordinary [[TheGoomba Moos]]... except only some of them are normal size. Others are on a parallel path in the background, and when they jump over to your path, they are revealed to be at least ten times bigger.
* ''Equinox'' embodies this trope. Items are the same size regardless of their distance from the camera, meaning it is often impossible to tell where objects are except by trial and error. What appears to be a tower made of discs might actually be a staircase.
* Used in ''KidIcarusUprising'' in the Labyrinth of Deceit. The effect works remarkably well in full 3D.
* [[http://terrycavanaghgames.com/nayasquest/ Naya's Quest]], by Creator/TerryCavanagh, uses this as its fundamental game mechanic: it uses a [[ForcedPerspective deliberately deceptive]] version of IsometricProjection to make it appear that platforms are in different locations than they actually are.
[[/folder]]

[[folder:Web Animation]]
* Nina Paley's ''Fetch'' does this repeatedly.
* The ''WebAnimation/HomestarRunner'' episode from which the page quote is taken. Marzipan is just explaining an art technique, but when a [[AttackOfThe50FootWhatever giant Bubs]] turns up immediately after, she says the same thing about his foot.
[[/folder]]

[[folder:Web Comics]]
* The trick is played on the reader in this [[http://www.giantitp.com/comics/oots0188.html strip]] of ''Webcomic/TheOrderOfTheStick''. Played with later on, when it turns out that the tiny piece of starmetal actually ''is'' huge, relatively speaking; the swordsmith says he's never seen a chunk anywhere near that big before.
* [[http://www.girlgeniusonline.com/comic.php?date=20081226 This]] ''Webcomic/GirlGenius''.
* [[http://buttersafe.com/2007/07/26/depth-perception/ This]] ''{{Buttersafe}}'' comic.
* Played with in [[http://www.nerd-boy.net/nbbrowse.php?beg=41&end=50#48 this]] ''Nerd Boy'' comic.
* Played with in [[http://drmcninja.com/page.php?pageNum=19&issue=8 this]] page of ''[[Webcomic/TheAdventuresOfDrMcNinja Dr. McNinja]]'' where the Doc says that armoured space suits were originally created to fight space monsters observed through telescopes. Of course, it turned out that they had gotten the scale wrong, and the space monsters are actually planet sized. We pray they continue not to notice us.
* Frequently used in ''PerryBibleFellowship''.
* [[http://www.dominic-deegan.com/view.php?date=2010-07-16 This strip]] of ''DominicDeegan''.
[[/folder]]

[[folder:Web Original]]
* [[http://vimeo.com/6782769 Chop Cup]]. Do not adjust your mind, there is a fault in reality.
* In the fourth {{asdfmovie}} a father is throwing a ball to his child off in the distance. [[spoiler:Actually they're just really small. Squish.]]
* {{WebVideo/Jerma985}} and {{WebVideo/STAR_}} used this trope in the beginning of '[=GTA4=]Invisibility Buttheads + More Nonsense' where Jerma positioned the camera so that it initially appeared that STAR_ and Jerma was sitting on a stoop [[spoiler: till STAR_ stepped on the gas pedal of the invisible boatmobile that they were sitting in all along and sent themselves flying about the streets.]]
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/TheSimpsons''
** In episode "Deep Space Homer", reporter Kent Brockman makes TV contact with a space mission just in the moment an ant set loose in the spaceship floats by the camera lens. Brockman's reporting jumps to the conclusion that a master race of giant ants has conquered the spacecraft and is about to invade Earth. He then pauses, looks at camera, and delivers the [[MemeticMutation immortal line]]: "And I, for one, welcome our new insect overlords."
** In the episode where the Simpsons act out folk tales, Homer as the giant lumberjack Paul Bunyan runs towards Marge, who thinks he's just a normal-sized man until he gets near enough for her to see his true scale.
** In the episode where Homer joins the Army, he escapes during wargames. As he's lying in bed with Marge, he looks out the window and comments on the helicopter in the distance... except it's a spy drone the size of an RC toy, and it's right in his window.
** Also in "Hurricane Neddy", when the folks want to help Ned rebuild his house, they end up doing a very poor job. One hallway looks normal from a distance, but due to forced perspective it is actually shorter and narrower than it looks.
-->'''Ned:''' Oh, something is definitely wrong with this hallway. ''(opens mini-door at the end of the hallway)''\\
'''Barney:''' Come on in! It's your master bedroom! ''(Ned shuts door)'' Ow! My nose!
* In an episode of ''WesternAnimation/AlvinAndTheChipmunks'', a bug on the lens of Simon's telescope caused them to think there was an alien invasion on its way to Earth.
* In an episode of ''ThePinkPanther'', the Panther plays a trick on his human foil (who is an astronomer this time) with a puppet show at the end of his telescope that convinces the guy he has discovered aliens on the moon.
* In the DonaldDuck war short ''Home Defense'', Donald's nephews are able to convince him that they're being attacked... by parachuting gingerbread men. Later in the short, a bee does a similar (but unintentional) dupe job.
* In the opening of the ''WesternAnimation/{{Futurama}}'' episode "Fear of a Bot Planet", Fry, looking out at a Saturn-like planet, comments on how the size of space puts everything in perspective. A few seconds later, the "planet" splats like a bug on their windshield.
* In the ''PhineasAndFerb''' episode "The Ballad of Badbeard", the children leap across a perilous gorge while monsters snap at their feet. Isabella then chastises Buford for playing around with his nifty, newly-found, monster hand puppets, right in front of the "camera".
* ''WesternAnimation/CowAndChicken'': This is how Chicken managed to use a golf-ball and fool the Red Guy (who was at that point an astronomer), and the entire world, into believing that the earth is about to be hit by a comet, and get everyone to buy "protection devices" which were just random junk he found around the house. When it turns out there IS a comet, it's in turn revealed to be the size of a golf-ball, and it hitting several of his "protection devices" was enough to minimize the damage it causes.
* On ''WesternAnimation/PlanetSheen'', Sheen volunteers to capture a feared beast called a chocktaw after seeing a picture of one dwarfed by a flower. Then he discovers that flowers on Zeenu grow to the size of redwoods.
* In one episode of the ''{{Babar}}'' animated series, Arthur and Zephir panic when they look through a telescope and mistake the glow of a firefly for an invading alien spacecraft.
* In ''KorgothOfBarbaria'' Korgoth points to some pigeons below them when asked how to get to the floating castle. Turns out they're twenty-foot tall pigeons.
* The ''WowWowWubbzy'' episode "Warp Speed Wubbzy" involves Walden spotting what he thinks is an incoming alien visitor, but is actually just a firefly, and Wubbzy and Widget pretending to be aliens to keep him from being disappointed.
* ''DanVs'' "The Beach": While out on the ocean, Chris looks through binoculars and spots what looks like his wife getting a back rub from the lifeguard, but the lifeguard was actually just smoothing the sides of a sand castle he built behind her.
* ''WesternAnimation/{{Wakfu}}''
** Used in episode 14 with Moon's entrance, with shadows and a close-up obfuscating temporarily the fact that the monkey isn't quite the expected size.
** Also when Rubilax [[spoiler:is freed from the sword]] in episode 22; it isn't immediately obvious that [[spoiler:he's half Sadlygrove's height. He doesn't stay that size for long, though.]]
* Bear's cave in ''WordWorld'' for some reason shows a room painted onto a wall for a door rather than an actual entrance containing a room. Makes people wonder how Bear is able to go in and out of her cave in the first place.
* In the BugsBunny cartoon "The Unruly Hare", Bugs screws with surveyor Elmer by sticking things in front of his transit (the device surveyors use to measure distances). First he holds up some magazine pin-ups, which Elmer {{wolf whistle}}s at, then smacks his own lips near the lens, which is when Elmer reaches out for a kiss. Later, Bugs holds up a lit match so that Elmer thinks the forest is on fire.
* In the ''{{WesternAnimation/Recess}}'' episode "The Box", T.J. is forced inside a chalk-colored box on the blacktop as punishment. An overhead shot and the color patterns make him look like he's trapped in a deep hole.
[[/folder]]

[[folder:Real Life]]
* Several videos seem to show ghosts or other mysterious appearances that are in reality showing a bug crawling across the screen. See [[http://www.livescience.com/strangenews/070621_santafe_ghost.html this page]].
* Tilt-shift (or Perspective Correction) lenses, common on medium- and large-format cameras, can be used to make photos of large scenes [[http://en.wikipedia.org/wiki/Miniature_faking appear to be miniatures]].
* A story about AndreTheGiant relates how, when first entering the business in his native France, he approached the promoter's table alongside a friend of normal stature. Because of Andre's condition (whereby he was relatively in proportion, despite his size), the promoter couldn't tell how massive he was from a distance, and apparently looked at André's friend and said to someone sitting next to him, "We'll never hire that midget..."
* Taking advantage of this is a fairly popular form of modern art, like the page picture.
** [[http://www.rense.com/general67/street.htm Julian Beever]] is an English artist who is famous for his art on the pavements of England, France, Germany, USA, Australia and Belgium.
* [[AbbeyRoadCrossing Abbey Road‘s iconic cover]] was remade on Perspective 3D Street art with {{Peanuts}} characters at [[http://www.thehighdefinite.com/2012/01/abbey-road-x-peanuts/ Universal Studios Japan]].
* Since the human eye uses both eyes to create a 3D image, using the subtle difference between each eye's perspective, some people who are blind in one eye can't excersize proper depth perception and thus their daily routine could be littered with this trope.
** You don't even have to be half blind. Some people just don't have that kind of depth perception. People would still be able to see depth fine if they keep moving, though. Instead of seeing something at two different angles at the same time, you see it at different angles at different times. The principle works the same.
** The above is evidenced by [[http://youtu.be/Jd3-eiid-Uw this YouTube video]] showing head tracking with a Wii Remote. Because the objects move and obey where they should be in depth, you can get the perception that you're seeing a 3D video, even though it's from a 2D video (and this doesn't require a 3D screen either)
** And the [[https://en.wikipedia.org/wiki/Pulfrich_effect Pulfrich Effect]], where viewing a scene moving horizontally with one eye covered with a dark lens causes that eye to lag. The amount of lag is enough that other eye sees a different enough perspective to trick the brain into seeing depth.
* A traffic reporter, reporting on a slowdown at a local vehicular tunnel, said it was due to a giant spider attacking cars at the entrance. A normal-sized spider had crawled onto the lens of the camera, and quite by chance gave the appearance of a giant spider attacking the cars, thus combining this trope with CrowningMomentOfFunny.
* It's been argued that reports of big cats roaming parts of the English countryside, the most famous being the "Beast of Bodmin", may just be normal-sized feral cats that look farther away than they really are.
* Reportedly, this happens all the time to people who live in jungles because they're so used to seeing everything close up. One anthropologist brought one of these people in a plane with him. The man commented about the beetles on the grass. The anthropologist couldn't convince the man that they were actually very large buffalo seen from far away.
* The Moon is actually both 400 times smaller than the Sun, and 400 times closer to Earth than the Sun. As a result, the two appear to be the same size.
** If we're going into astronomy, we might as well talk about quasars and their red shift. For decades, scientists were unsure whether these strange objects moving away from us were close by and fairly faint, or as distant as the Hubble Law suggests and therefore brighter than anything else that we have ever experienced. It was only through gravitational lensing from distant galaxy superclusters that we found out just how far away these things really are.
** As for the Moon, the Apollo astronauts had trouble judging the sizes of distant objects because of the way light works in space. While binocular vision is great at short distances, it's relatively useless farther away. For farther objects, we take visual cues from the way air gradually absorbs and disperses light, making distant things look fainter. With no air on the moon, that effect doesn't exist. There is footage of one astronaut bounding off to an apparently small nearby rock. And he keeps hopping. And keeps hopping. Until he's dwarfed by the gigantic rock that he's standing beside.
** Also, a star's apparent and absolute magnitudes. The ''apparent magnitude'' is how bright it appears in Earth's sky, while the ''absolute magnitude'' is how bright it actually ''is'', corrected for distance.[[note]] Basically, it's what its apparent magnitude would be at 10 parsecs (about 32.6 light-years) away from the star.[[/note]] Apparent magnitudes have been known (approximately) since ancient times; absolute magnitudes had to wait until the mid-1800s, when astronomers' equipment got good enough to measure the distance to stars.
** Constellations look like a lot of similar stars relative near one another, but most are made up of somewhat dim stars that are coincidentally in the same general direction as much brighter stars much farther away.
* Similar to the jungle example, people used to (unconsciously) using things like trees and buildings to judge relative distances often have trouble when placed in environments like the Arctic tundra or deserts: in the right conditions, hills which appear a short distance away end up being many kilometers away, while a distant range of hills turns out to be a small mound a few hundred meters away.
** This is sometimes what leads hikers to suffer dehydration and exhaustion - they may think their target destination is much closer than it really is.
** Also can be seen when admiring an island off the coast. How many people have thought, "I wonder how long it would take to swim out there?"
* The city of Grand Rapids. Coming up to downtown, it looks like a fairly large city with a few huge buildings. Then you go through it and realize the buildings are a quarter as large as they appeared to be, and that it doesn't take more than 10 minutes to walk through the entire downtown district.
* The British journalist John [=McCarthy=], after being imprisoned in Lebanon for several years, lost his depth perception (he had been chained to a radiator, in a tiny room, with a bag over his head). He only realized this after he had driven hundreds of miles to Wales for a holiday (well-earned, one thinks) shortly after his release, and noticed the "funny looking mountains" (actually valley sides, a few hundred meters away).
* The reason [[http://pics-for-fun.com/wp-content/uploads/2013/08/huge-grasshopper-attackes-the-town.jpg this image]] has been passed around the Internet a few times is due to this trope making a relatively large grasshopper appear to be a giant attacking the town.
[[/folder]]

----