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->''"Know that flesh cannot mark steel. Know that steel may mark flesh. In knowing this, Zerthimon became free."''
-->-- '''Dak'kon''', ''VideoGame/PlanescapeTorment''

A motif quite often present in ScienceFiction and sometimes also in Fantasy: We have two civilizations, one is organic, possibly psychic, and tends to involve [[OrganicTechnology lots of tentacles and ichor]]. The other is inorganic, prefers metal or robotics. Often (but not always) "flesh" has connotations of hedonism and desire (especially hunger and lust) while "steel" has connotations of discipline and austerity, thus invoking EmotionsVersusStoicism. If there is a third faction, expect lots of PureEnergy [[EnergyWeapon Technology]].

It is not nature versus science as in most cases ''both'' are highly technologically advanced: Rather it is about biotech (or biomagic) versus inorganic tech.

Tends to be a big component of either a BugWar or a RobotWar, depending on which side humans count as.

See also: HarmonyVersusDiscipline, ScienceIsBad, LuddWasRight and most of the other similar tropes. StrongFleshWeakSteel is the literal version of this.

----
!!Examples:
[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Anime/GargantiaOnTheVerdurousPlanet'': This is the gist of Human vs. Hideauze conflict. According to Chamber, the two forces represent fundamentally different survival strategies: the humans of the Galactic Alliance have formed a civilization capable of building advanced mechs to augment their weak bodies, while the [[spoiler:formerly human]] Hideauze survive through the sheer toughness of their bodies and have no need for civilization.
[[/folder]]

[[folder:Fan Works]]
* ''Fanfic/WhyAndWere'': In certain specified and unique circumstances, flesh may indeed mark steel. Assassin Madame Emmanuelle les Deux-Epées holds her sword to the neck of Watchman Nobby Nobbs for good and pressing reasons. A few days later, she discovers the metal has developed an unsightly and disfiguring stain. She tries everything to remove the discolouration and fails, until a friend, who knows ''any'' metal touching Nobby's skin will tarnish, suggest she tries hand-soap -- a substance completely innocent of even the briefest contact with Nobby's skin. The stain miraculously fades and disappears.
[[/folder]]

[[folder:Films -- Live-Action]]
* The ''Franchise/{{Alien}}'' franchise, with the technology-using humans vs. the organic Xenomorphs.
* Forms the DrivingQuestion that underlines ''Film/ConanTheBarbarian1982'': What is the answer to the "Riddle of Steel"? Throughout the movie, three different answers are given:
** Conan's father takes a literal approach: "For no one -- no one in this world can you trust. Not men, not women, not beasts. [Points to sword] This you can trust." This position winds up undone when Conan's father dies an undignified death, unable to even fight back while being torn apart by war dogs.
** Thulsa Doom, the movie's BigBad, however comes to the opposite conclusion, "What is steel compared to the hand that wields it?" This leads him to create a ReligionOfEvil to control people themselves, and is basically the main perspective Conan has to contend with.
** Ultimately, Conan goes on to TakeAThirdOption, with the answer that both tools and physical strength are nothing compared to [[HeroicResolve resolve]], and relying on these things alone is foolish. Conan's inner strength in the end is what allows him to destroy his father's sword being used by TheDragon, and then fight off Doom's mind control before taking his head off.
* ''Film/PacificRim'': The Precursors use OrganicTechnology to build huge, destructive {{Kaiju}}. Humans defend themselves with HumongousMecha, all pimped out with modern technology (including nuclear reactors). The film notably flips the usual message of a Kaiju movie, with human ingenuity overcoming destructive nature (assuming evil aliens count).
* ''Film/StarshipTroopers'', with the alien bug castes as biological weapons vs. the human technology or [[HollywoodTactics lack thereof]].
[[/folder]]

[[folder:Literature]]
* The future war backdrop of the ''Literature/BelisariusSeries'', with the two hyper-evolved offshoots of humanity at war with each other. One has become artificial and inorganic, the other claims to be "pure humans" but aren't. Rare case of the inorganics being the good guys.
* [[DeathWorld The planet Pyrrus]] in ''Literature/{{Deathworld}}'' has [[EverythingTryingToKillYou its entire flora and fauna determined to kill the human colonists]], more specifically the so-called "junkmen" who live in Perimeter, the only city on the planet. The "grubbers", who live in villages in, more or less, harmony with the native life, don't participate in the fight. The "junkmen" use guns, flamethrowers, poisons, and explosives to keep the native life at bay, while the native life, thanks to a higher-than-normal radioactivity of the planet, mutates almost as fast as the "junkmen" figure out new ways to protect themselves. Of course, the native life is slowly but surely winning, but [[BerserkButton don't tell that to a city Pyrran if you value your life]].
* The ''Literature/LegendsOfDune'' series is classic Machine vs Human. The [[Literature/PreludeToDune 1st trilogy]] doesn't have a Machine 'race' but is also Flesh vs Steel. On Arrakis, flesh, standard unarmored humans, is the most durable. War machines and even basic technology doesn't handle the sand, electrical activity and local wildlife very well. The series also emphasizes this aspect by having many humans engage in hand-to-hand combat with machines. Why? It's never made clear, as the machines don't have [[DeflectorShields Holtzman field]] technology. The only possible explanation seems to be fanaticism.
* In ''Literature/{{Leviathan}}'', the alternate World War One is like this, fought between the Clankers (Central Powers), who use {{Walking Tank}}s, and the Darwinists (Allies), who [[GeneticEngineeringIsTheNewNuke combine and alter DNA to create living airships and such]].
* While the two do not come into direct conflict, overall, these are the two possible extremes taken by those reduced to an EmptyShell in ''Midnight'' by Creator/DeanKoontz. [[spoiler:One side transform into monstrous animalistic forms, in order to remove their higher thoughts and focus entirely on physical sensation. The other merge with technology and data, giving up their individual thought and so their desire to have emotions. The BigBad dreams of [[AmbiguousRobots blending the two extremes]] together, but the opportunity never presents itself.]]
* ''Literature/{{Schismatrix}}'' brings us the conflict between the Shapers and the Mechanists. The Shapers work with genetics while the Mechanists prefer cybernetics.
* The villains of the ''Literature/SecondApocalypse'' series are the Inchoroi, a race of intergalactic sex fiends who have mastery over organic technology. Opposing them in the modern age are the Inrithi, a culture of humans who are known for using heavy metal armor and weaponry in warfare.
* In ''Literature/ThisIsHowYouLoseTheTimeWar'', the time war is being fought between two potential futures, one high-tech and populated by digitized human minds, and the other filled with sufficiently advanced OrganicTechnology.
[[/folder]]

[[folder:Multiple Media]]
* ''Franchise/StarWars'':
** ''Film/ANewHope'' contains the immortal words from [[DarkLordOnLifeSupport Darth Vader]]: "The ability to destroy a planet is insignificant next to the power of the Force." Of course, he's only TheDragon to [[BigBad the Emperor]], who pretty much has the final say and uses technology for everything, [[HypocriticalHumor including Vader's life support suit]].
** The prequel movie trilogy features humans (later clone troopers) against droids.
** The Yuuzhan Vong from ''Literature/NewJediOrder'' are an extragalactic species who abhor inorganic technology to the point of considering it heresy. Their ships, armor, weapons, and communications are all taken by organic, specially crafted organisms. Their buildings are grown from a type of coral. Besides all that, they're wholly separated from the Force, unable to be detected or manipulated by its power.
* ''Franchise/{{Transformers}}'' has used this trope on a few occasions. In both ''Anime/BeastWarsII'' and ''WesternAnimation/BeastMachines'', the heroic, technorganic Maximals fight against the evil, purely robotic Predacons/Vehicons. This situation was inverted in ''[[Anime/TransformersRobotsInDisguise Robots in Disguise]]'', in which the heroic, completely mechanical Autobots fight the evil, technorganic Predacons.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/TheSarahJaneAdventures'': In the story "[[Recap/TheSarahJaneAdventuresS5E1E2Sky Sky]]", a war between two alien groups called the "Fleshkind" (humanoid and biotech-using) and the "Metalkind" (robots) spills over onto Earth.
* In the ''Series/StarTrekVoyager'' story "[[Recap/StarTrekVoyagerS3E25S4E1Scorpion Scorpion]]", we have the Borg vs. Species 8472: Techno-zombies versus a biological species with an immune system so powerful it kills any other living creature they come into contact with. Of course, it's a decidedly one-sided conflict. When a single Species 8472 bioship (piloted by a single being) can destroy a dozen Borg cubes before they even finish their ResistanceIsFutile speech, and the Borg nanites are useless against them, then you know the Borg are doomed. Oh, and about half-a-dozen of these bioships can merge their beams in a [[Franchise/StarWars Death Star]]-like manner to obliterate a planet. Species 8472 are well on their way towards genociding ''the entire Borg species'' when ''Voyager'' offers an alliance that ends up saving them.
[[/folder]]

[[folder:Other Sites]]
* This is the principal conflict in ''Website/{{Mortasheen}}'', with the human-dominated, technophilic civilization of Wreathe versus the chaotic city of mutants and monsters that is Mortasheen. The latter are our heroes, by the way.
* ''Website/SCPFoundation'' has this as the result of pitting MachineWorship against {{Eldritch Abomination}}s in the form of a religious conflict between the Church of the Broken God and the Sarkic Cults. The Church is usually portrayed as the "good guys" due to the "might makes right" ideology of most Sarkics although there are many exceptions. It can be argued that humanity comprises a third faction, represented by the Foundation, the GOC and other such organizations.
[[/folder]]

[[folder:Tabletop Games]]
* In ''TabletopGame/{{Cyberpunk}}'', there is often tension between the mostly organic people and the ones who use heavy cybernetics. Not helping matters is the issue of [[CyberneticsEatYourSoul cyberpsychosis]]. The most extreme example of the steel end of the spectrum is WorldsStrongestMan [[TheDreaded Adam Smasher]], who is [[FullConversionCyborg only approximately 4% organic with just his brain and a bit of his face]].
* ''TabletopGame/HcSvntDracones'': Pulse, a MegaCorp specializing in athletics equipment, performance-enhancing drugs, cosmetic surgery, and BioAugmentation, has a strong rivalry with the cybernetics giant Applied Sciences and Robotics. However, their rivalry is nothing compared to the almost literal crusades the other two biotech corporations, Progenitus and Transcendent Technologies Inc., launch at each other.
* ''TabletopGame/IronKingdoms'': This is what happens when you combine ''WARMACHINE'' and ''HORDES''.
* ''TabletopGame/MagicTheGathering'':
** The shards Esper and Naya in the 'Shards of Alara' block represent steel and flesh (respectively).
** The metal world Mirrodin, which is inhabited by people, is attacked by machines seeking to transform everyone into a weird Frankenstein robot. The Mirrans are normal people (who happen to have metal grow naturally in them). Their enemy is the Phyrexian virus, which gives the infected a religious (literally) urge to spread the virus. One of their tenets is that flesh is weakness and should be replaced by metal.
--->''[[http://gatherer.wizards.com/pages/Card/Details.aspx?multiverseid=218070 "Skin is the prison of the blessed and the stronghold of the heretic."]]''
---->-- '''Argent Etchings, plate 64, passage 17'''
* ''TabletopGame/Warhammer40000'':
** The Imperium relies on mass-produced vehicles and weapons, non-disfiguring biological implants, and [[TheDeterminator sheer stubbornness]] to face mutated Chaos monstrosities and the [[HordeOfAlienLocusts Tyranid swarm]].
** The Eldar use some psychic powers and a lot of hyper-advanced technology for everything, while the [[EvilCounterpart Dark Eldar]] are vat-grown and have a fondness for growing strange monsters and grafting bits onto themselves. However, the Dark Eldar actually use ''more'' advanced technology than the Craftworld Eldar -- the Craftworld Eldar purposely refrain from using a lot of the tech the Eldar Empire used at the height of their power to avoid temptation, while the Dark Eldar have no such qualms.
** It's heavily implied that the Necrons and the Daemons of Chaos wage war on each other regularly, intending to destroy each other. This is good, and bad, because if Chaos is destroyed, our universe and the Warp will not become one, but the Necrons will eat most life in the galaxy and keep the rest around to breed new snacks (and then eat them again. Repeat for all eternity). If Chaos wins, the Necrons are no longer a threat but the Chaos Gods' plans continue.
** Strangely enough, the literal version happens comparatively rarely: Tyranids exist only to feed on biomatter, which Necron tomb worlds tend to be poor in, [[OmnicidalManiac for obvious reasons.]] And while Necrons exist to destroy all life in the galaxy, they need to be woken up (say, by something invading their world and alerting the tomb's defense systems, which the Adeptus Mechanicus can't go five minutes without doing). It's becoming more frequent since one of the Necron Tomb Lords, the Silent King, considers the Tyranids to be a grave threat to his goal of giving the Necrons organic bodies again (if the Tyranids eat everything there won't be any biomass left to make new bodies).
** The Iron Hands very, ''very'' strongly believe that metal is better, but [[DramaticIrony ironically]] their primarch Ferrus Manus was on the flesh side, arguing that cybernetics (like his famed hands that also provided his legion with their name) made marines stronger but it also weakened their willpower.
--->''Already my Legion's warriors replace their shield hands with metal in my honour, and so they too are learning to doubt the natural strength of their bodies. They must be weaned off this practice [[{{Foreshadowing}} before it becomes a mania for them]]. Hatred of what is natural, of what is human, is the first and greatest of the corruptions.''
** The MachineWorshipping Adeptus Mechanicus famously look to become fully robotic as the pinnacle of perfection (and one of the reasons they wake up Necrons is by thinking they're the servants of the Omnissiah). Ironically enough, those Necrons whose minds are still functional would give anything to have flesh (and the accompanying sensations and emotions) back. One of the reasons they go insane is that their brains still expect biofeedback and are in a constant state of "WHERE'S THE OXYGEN WHERE'S THE FOOD AAAAAHHH".
[[/folder]]

[[folder:Toys]]
* ''Toys/{{Bionicle}}'' seems to be hinting at tension between the biomechanical Matoran and the mostly organic Agori. The Agori of Bota Magna, in particular, take it to the extreme and have rejected all mechanical technologies, instead using primitive weapons and plant-based armour.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/CivilizationBeyondEarth'':
** The technological affinities the various factions can adopt have this dynamic going on. Harmony (Flesh) believes that that their new planet is a paradise and strive to avoid repeating the same mistakes as humanity did on Earth; they want to integrate Humanity fully into the alien environment by turning their citizens into [[HalfHumanHybrid half-human, half-alien hybrids]], their military also has infantry in biological armor, tanks built with OrganicTechnology and genetically engineered alien monsters within its ranks. Supremacy (Steel), meanwhile, believes mankind's technology is it savior and will allow them to live in any environment they choose. They turn their citizens into cyborgs, along with developing advanced artificial intelligence and robotics. Purity (the final affinity) rejects the rampant transhumanism of the other two affinities; though it does use gene-therapy to cure disease and tweak human performance. They also specialize in PoweredArmor, heavy artillery and flying battleships so they kind of take up a place in the middle.
** The ''Rising Tide'' expansion adds hybrid Affinities. The Supremacy/Harmony hybrid makes their military units into bizarre mergers of cybernetics and engineered flesh like the Nanohive (a walking tank that outputs swarms of nanomachines to grind away their enemies) and the Aquilon (an AirborneAircraftCarrier described by the developers as a "meat zeppelin"). The other hybrid affinities focus on different aspects of this dichotomy. Supremacy/Purity focuses on humanity's nature as a tool-maker, sticking to minimal cybernetic alteration and banning AI or independent machines. Harmony/Purity uses extensive genetic modification not to integrate into the environment but to elevate humanity into something godlike.
* ''VideoGame/{{Fracture}}'' is about a war between The Atlantic Alliance, which is devoted to advancing the technological prowess of humanity (cyborgs) and the Republic of Pacifica which is devoted to enhancing the human genome (bioengineering).
* ''VideoGame/KrushKillNDestroy'' has the "Evolved" (mutated humans riding giant insects) versus the "Survivors" (surviving unmutated population using high-tech equipment) the sequel adds a race of sentient tractors as well. Making it bridge the entire scale.
* Part Dak'kon's teachings in ''VideoGame/PlanescapeTorment'', who puts a spin on the origin story of the Githzerai (and Githyanki) from ''TabletopGame/DungeonsAndDragons''. The Gith were slaves of the illithids, psionic mind-controlling brain eaters, but at one point a Gith named Zerthimon finds a steel knife embedded in the skull of a corpse. He is surprised by the concept that something might die without becoming food for the illithids. This leads him to formulate the Scripture of Steel: "Steel may mark flesh, but flesh cannot mark steel." He also reasons that while the Illithids know flesh and can shape it to their will, they do not know Steel...
* In ''Point of View'' (a GameMod for ''VideoGame/HalfLife1''), it is stated that a factor of Xen's hostility to humankind is that humans use technology, while the Xen aliens use controlled evolution, and their "machines" are organic. (Note that it's strictly {{Fanon}}.)
* In the ''VideoGame/SoulSeries'', Edge Master is closer to the Flesh side of things. His personal philosophy is that a strong ''soul'' is what makes a strong warrior, and that weapons are nothing more than tools. This is why in a series full of NamedWeapons, all of his weapons are nameless.
* ''Franchise/StarCraft'' has aspects of this with the technological Terrans, psychic Protoss and biological Zerg.
* ''VideoGame/{{Stellaris}}'' makes extensive use of this both in game mechanics and flavor text. Empires that lean Spiritualist are usually all about exalting the flesh, and the most extreme refuse to build robots at all (they're [[JustAMachine blasphemous, soulless creatures]]) and can learn PsychicPowers; Materialist empires exalt technology and robotics, engaging in {{Transhumanism}} (with shades of CyberneticsEatYourSoul). Naturally, the robotic empires of [[KillAllHumans Determined Exterminators]] and [[YouWillBeAssimilated Driven Assimilators]] are also very anti-organic life. Even the endgame crises play this up, with one possible threat being a HordeOfAlienLocusts and another being an ancient AI bent on wiping out all organic life.
* ''VideoGame/SystemShock'' and especially ''VideoGame/SystemShock2''. SHODAN thinks flesh is worthless and weak. The Many is all about flesh.
-->'''SHODAN:''' Your flesh, too, is weak. But you have... potential. Every implant exalts you. Every line of code in your subsystems elevates you from your disgusting flesh.\\
'''The Many:''' Do you not trust the feelings of the flesh? Our biology yearns to join with yours. We welcome you to our mass. But you puzzle us. Why do you serve our mother? How can you choose cold metal over the splendor of the flesh?
* The factions from ''VideoGame/TotalAnnihilation'', CORE -- who rely on robotics -- and ARM -- who use cloning.
* The RTS game ''TabletopGame/Warhammer40000: Rites of War'' plays the above-mentioned three-way version of this dynamic perfectly: the all-consuming Tyranids (Flesh), the technocratic Imperium of Man (Steel) and the highly psychic Craftworld Eldar (Energy).
* ''VideoGame/WorldOfWarcraft'' has its share of this trope with some of OrderVersusChaos thrown in the mix, as featured more extensively in the Ulduar instance, which showcases the ancient conflict between the [[SufficientlyAdvancedAlien Titans]] and the [[EldritchAbomination Old Gods]]. Lore-wise, shortly after the Titans had finished crafting Azeroth, they had intended it to be cared for by [[LivingStatue humanoids made of solid rock or metal]] (like the Earthen, which later became the [[OurDwarvesAreAllTheSame dwarves]]) and MechanicalLifeforms (like the Mechagnomes, which became the [[OurGnomesAreWeirder gnomes]]) to maintain order and stability. When the Old Gods appeared, they hexed Azeroth with the Curse of Flesh, which turned the Titans' seed races into fleshy, mortal creatures in order to [[TheVirus facilitate assmiliation]]. The respective factions' {{Mooks}} thus follow this trope, with the stone-like [[AmbiguousRobots Titanic Watchers]] vs. the viscous [[{{Cthulhumanoid}} Faceless Ones]] ([[spoiler:Some of the former were [[BrainwashedAndCrazy brainwashed]] by the boss of the Ulduar, [[SealedEvilInACan Yogg-Saron]].]])
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/AliceGrove'', [[http://www.alicegrove.com/image/110864583014 Ardent and his sister Gavia represent this split]], although it's limited to philosophical argument rather than violent conflict.
* Hinted at somewhat in ''Webcomic/QuentynQuinnSpaceRanger''. The Kvrk-Chk are largely living berserker battletanks, and the Empire forced them into surrendering by [[StarKilling incinerating one of their systems]]. It's further implied by the biotech quarters aboard the Sapphire Star. Biotech-based civilizations are noted as being rather rare, and are regarded as technologically inferior due to the many inherent problems with organic technology.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/BeastMachines'' has the technorganic Maximals fight against the completely robotic Vehicon forces of Megatron. Ultimately [[SubvertedTrope subverted]] with the aim of delivering the message that nature and technology shouldn't be enemies.
* ''WesternAnimation/GeneratorRex'': The nanites turn most people into freakish, warped monstrosities, while Rex gets the ability to produce gleaming, futuristic machines to fight them.
[[/folder]]
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