M: I just had a thought. I hope that you and the internet might be able to start answering, if not completely answer. A lot of movies involve some kind of situation where a trap will be laid and will be centuries old and will still work. Let's say, hypothetically, in modern times you wanted to make something like that. What parts of the movie versions of these ancient traps are some kind of practical? And which ones are either completely impossible or, at the very least, in their depicted form, would require regular updating or maintenance? I'm thinking of one particular example for that maintenance question, but I want to see what you come back with first. Like I thought I said, but to make it explicit, please go online and see if you can find anything there to work with and combine it with anything that you come up with on your own.
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G: I can’t help with how to build traps (even “hypothetically”), but I can do a reality-check on the movie versions: what could plausibly still be dangerous after centuries, and what basically can’t work without upkeep.
Archaeologists/Egyptologists generally say the classic “booby-trapped
pyramid/tomb” idea is not supported; ancient sites relied more on
blocking, concealment, difficult access, and deterrence
than on elaborate lethal mechanisms. citeturn0search6
And when people talk about Qin Shi Huang’s tomb having crossbow traps,
it’s mostly textual tradition + speculation—the tomb
chamber itself hasn’t been excavated, so claims are inherently
uncertain. citeturn0search3
1) Gravity-only, passive hazards (no stored energy) — most
plausible
If it’s “dangerous” because of weight, geometry, and brittle
materials, it can remain dangerous as long as the structure
stands: unstable masonry, loose stone plugs, concealed shafts, voids,
undermined floors, etc. This isn’t a “trap” so much as latent
structural failure, but it’s the closest real-world analog to
the trope.
2) Simple stone/earth works used as “traps” for animals or
people
Archaeology does document long-lived trap structures (e.g.,
large stone-built game trap systems). They “work” across long time spans
because they’re basically landscape architecture, not delicate
machinery. citeturn0search23
3) “Chemical danger” as a side effect, not a
mechanism
Tombs can contain genuinely hazardous stuff (molds, dusts, degraded
materials, sometimes heavy metals like mercury in the Qin context), but
that’s very different from a designed “poison gas trap.”
citeturn0search3
A) Anything with stored mechanical energy (springs,
bent wood, torsion bundles, tensioned rope, cocked crossbows)
Energy storage is the enemy of longevity: materials creep, relax, rot,
corrode, seize, or snap. Metal + wood interactions are also chemically
ugly over time (corrosion products can damage adjacent wood; moisture
cycling accelerates failures).
citeturn0search4turn0search7turn0search12
B) Anything with precision moving parts (gears,
triggers, counterweighted linkages, “perfectly balanced”
mechanisms)
Even if it doesn’t rot, it tends to bind: corrosion,
mineral deposits, swelling/shrinking wood, grit intrusion. Real
long-term mechanisms are either sealed and maintained…or they eventually
become sculptures.
C) “Poison dart” / “poison needle” tropes
Two separate problems:
D) Sealed “gas chamber” traps
Gases diffuse; seals fail; pressure equalizes; reactive chemicals absorb
moisture or neutralize. You can have bad air in enclosed
spaces, but it’s not a reliable designed “triggered gas weapon” over
centuries.
E) Flooding-room traps
Any system relying on watertight doors, intact cisterns,
valves, and predictable hydraulics is a maintenance hog. Seals,
sediments, and cracks win.
Because the camera needs: instant cause → instant effect, one person triggers it, and it stays “armed” for 2,000 years with zero inspection. Real engineering tends toward the opposite: if it’s lethal and mechanical, it’s also fragile and maintenance-bound.
A lot of “traps” that feel like traps are really security architecture: false corridors, chokepoints, heavy portcullis-like blocks, confusing layouts, and “make entry costly” design. That aligns much more with what specialists describe for pyramid/tomb security than dart launchers do. citeturn0search6
日本語（にほんご）
If you tell me the specific maintenance-heavy example you had in mind, I can map it onto the categories above (stored energy vs seals vs moving parts) and call out exactly what would fail first.
M: I'm wondering, for Part B, if it was made out of stone, if there was some kind of oil you could apply. You know, like the kind of mechanical storage oil that... I don't even know if it's real, but that I've heard about when you talk about storing tools or guns or things like that. You know, the kind of stuff where it renders it impossible to immediately pull out and use, but also prevents the kind of structural stiffening that you're talking about. Because, theoretically, these are one-time use, or at least most of them are, so any kind of packing oil or whatever wouldn't need to be reapplied. Of course, that brings to the question of, you know, one-time traps and something that's supposed to last for centuries, but that wasn't the current issue being addressed. The part I had in mind about at least requiring some sort of cult maintenance or something was the classic arrow or dart trap. Not for the reasons you mentioned, at least not there, but because you don't stick a piece of wood in a hollow for 500 years and expect it not to go bad in some form. Certainly not to be, you know, launched with any kind of accuracy. That kind of projectile and also in the same category rope-based stuff usually piques my interest or at least pets my peeve. Just because the implication is that someone has been coming in and doing maintenance for years. In a couple of the classic movies, that's actually a reasonable thing to expect. Like Indiana Jones. There's enough guys immediately on the scene after the dramatic boulder run to imply that a couple of them might have been sticking around and maintaining everything, although that would be a job that could potentially suck unless you religiously framed it as some sort of macho test of your approval by the gods, even then it might still suck. But when it's supposed to be something long abandoned and there still are functional, you know, wooden darts or something, toxins don't even come into play at that point. The wood itself should have snapped on launch or something like that due to being brittle. Or if some kind of rope is supposed to be centuries old but still holding, it's just laughable. Perhaps with the workaround of, or at least the viability of, situations with the involvement of a dystopian future where metal cables or metal shafts could plausibly replace the otherwise wooden parts of various trap types. I'm not sure if that really has come up very often in movies or any other media. You know, a situation where civilization fell enough to get back to the point of bloody sacrificial altars in hidden temples populated with traps, but still close enough to the fall of civilization that there's enough metal kicking around to be fashioned into those traps.
G: You’re circling exactly the right fault lines. If we keep this at the materials-science / plausibility level (not “how to build”), a few things become clear.
What people usually mean is long-term corrosion inhibitors (cosmoline, heavy mineral oils, waxy greases) used on firearms and tools. These absolutely work at:
They do not preserve:
Firearms stored in cosmoline are famously not immediately usable; they require cleaning and re-lubrication before reliable function. That’s fine for an armory, but it’s the opposite of a “centuries-later, instant-trigger” movie trap. citeturn0search10
Stone has three long-term enemies:
Add oil, and you get:
So even a purely stone trigger ends up either locked solid or so loose it misfires, unless periodically serviced. This is why ancient stone devices that do persist (mills, presses) are simple, massive, and maintained.
You’re completely right: wooden darts lasting centuries is fantasy, even before toxins enter the picture.
Archaeological wooden artifacts that survive millennia do so because they were:
A dry tunnel wall with airflow is exactly the opposite. citeturn0search11
Natural fibers (hemp, sinew, plant cordage):
A centuries-old rope holding tension without inspection is pure movie logic. citeturn0search12
Your instinct that “someone must have been maintaining this” is not nitpicking—it’s the only way it works.
In entity["movie","Indiana Jones","film franchise"], the films repeatedly show:
That implicitly answers the maintenance question. The movies don’t dwell on it, but the worldbuilding supports it just enough to keep suspension of disbelief intact. In contrast, “long-abandoned ruin + perfect dart trap” has no such excuse.
This is where your dystopian angle actually improves realism.
But:
Metal cables last longer if unloaded. Under constant tension, even steel suffers creep and fatigue over long timescales. Still, they’re vastly more plausible than plant fiber.
Metal lets a trap plausibly remain dangerous, not precise. Think:
Precision vs. persistence.
Movies pretend you can have both without caretakers. Reality says you get one.
If you want a centuries-old danger with no cult:
That’s where archaeology actually points, and it explains why real ancient sites kill people without dart launchers.
日本語（にほんご）
Bottom line: your irritation is well-founded. The moment a trap relies on stored energy, elasticity, or precision, the story has already smuggled in either maintenance, magic, or cheating physics.
M: That just gave me an interesting thought. Is there any instance you know of, or that the internet knows of, where a fictional world possessed magic, but not in the dramatic way that it's usually depicted, but instead only as a force of physics that could influence, but not do all the dramatic stuff, but in that small way that can cause massive alterations in tactics, depending on what you're doing. Like in this case, I'm talking about a kind of magic that is defined as not being powerful enough to materialize darts and reset itself each time, but that, when appropriately applied, could, for instance, be used to counteract the slow erosion of a stone trigger grinding against another stone. The kind of magic that wouldn't lead to wizards battling each other on towers, but that would let all of the little engineering problems that we discuss in this world be literally dealt with by magic, in that small way that allows for some form of functionality which is only considered as being an ideal case in this world without magic.
G: Yes—there are fictional settings that treat “magic” less like fireworks and more like an extra term in the physics equations. Not many, but enough to form a recognizable pattern. What unites them is that magic is weak, local, constrained, and boring enough to be used for engineering rather than spectacle.
Below is a tight map of the closest matches to what you’re describing, ordered from most like “physics with a new variable” to still magic, but deliberately de-romanticized.
Some worlds explicitly treat magic as:
Your stone-trigger problem is exactly the kind of thing these systems quietly solve.
This is the cleanest fit.
Magic is:
Importantly:
Your example—using magic to counteract stone-on-stone erosion—is exactly the sort of low-grade warding that would exist here. No summoning darts. Just suppressing wear, creep, or microfractures.
This is engineering magic, not hero magic.
Magic here is:
Most magic is about:
The important thing:
Magic doesn’t scale well. It’s not good at spectacle, but it’s
excellent at maintenance, continuity,
and exception handling.
A stone mechanism quietly preserved by a charm laid centuries ago fits perfectly—especially if no one remembers it’s there.
Le Guin’s magic is explicitly constrained by balance.
Key idea:
Every magical act has a cost, usually elsewhere.
As a result:
Using magic to counter erosion, friction, or fatigue makes far more sense than using it to launch darts. It’s the lowest-energy solution, which Earthsea consistently favors.
Not magic per se, but philosophically aligned.
Alchemy:
This creates a world where:
This is what your dystopian-metal scenario wants to be.
Magic exists, but:
When it is used, it’s often for:
Flashy magic draws attention and gets you killed. Quiet magic keeps systems running longer than they should.
You’re talking about magic as an anti-entropy field:
Think:
This would:
It’s powerful because it’s boring.
Most fantasy avoids this because it:
If a setting has this kind of magic, traps stop being weapons and become environmental hazards:
Which is, interestingly, much closer to how real ancient sites actually kill people.
日本語（にほんご）
If you want, next we can:
M: One more thing to check, because the way you describe it, it's entirely possible that what I'm talking about actually does exist, but doesn't know it. Is it possible for you to check online for a kind of fiction, you know, whether it's a movie or a book or something, where the magic I'm talking about... exists, but not in the way I've described it, but instead is some form of, you know, super science or something like that. In that the story or just the setting for the story requires the extra physics or whatever to exist, but it's never actually addressed in terms of what it does. I'm thinking of someone trying to imitate Isaac Asimov or something, where either as part of their plot or just as a setting for their story, there's a claim of some kind of discovery in physics that's never directly addressed in terms of what it is, but that seems to do stuff like prevent entropy, like I'm describing, or some other basic boring change to physics equations that allows for ideal situations to become reality.
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G: Yes. In SF it often shows up as “a new term in the equations” that the story treats as mundane infrastructure, and it’s barely interrogated.
Known Space explicitly describes a “Slaver stasis field” as a bubble
of spacetime disconnected from the entropy gradient of
the rest of the universe, with time effectively stopped inside and
indefinite preservation as a consequence.
citeturn1search2turn0search6
This is basically your “boring physics change” made into a
piece of found/ancient tech. The stories don’t need to explain the deep
physics; they just rely on the operational fact that decay
doesn’t happen in the bubble.
These are classic examples of “extra physics” the setting requires, where the narrative treats them like ship subsystems rather than new laws of nature:
They’re not framed as “magic,” but they behave like it: they let you do things that, under normal physics, shred materials and bodies. Trek tends not to cash this out into “therefore entropy is different,” but functionally it’s the same kind of cheat: idealized stability under extreme conditions.
There’s a long-standing SF idea (from Clarke’s Third Law) that some
technology is so advanced it’s indistinguishable from magic; fandom
commonly calls that “clarketech.” citeturn1search3turn1search7
Your “anti-entropy maintenance effect” fits perfectly as clarketech
infrastructure: powerful in aggregate, boring locally, and never
explained beyond “it works.”
If you want the vibe where society doesn’t have wizard-duels because the tech is only good at boring stabilization, the settings that do best are the ones where the miracle is stasis / preservation / integrity rather than offense. That’s why stasis fields are the best single search-hit for your concept: they solve the “centuries later, still functional” problem without needing self-resetting mechanisms.
日本語（にほんご）
If you want a tighter match than “stasis,” the next closest cluster is fiction that uses self-repair / self-organization (often nanotech) as a background assumption—also “anti-entropy flavored,” usually handwaved, and massively tactically distorting once you think about it.
M: I figured we should check because of all that, you know, Huxley, I think, was the guy who said, you know, sufficiently advanced technology is indistinguishable from magic or something like that. In a world where it was only available for boring applications, I don't think that there would be any practical difference.
G: Small correction first, because you care about precision:
That line is Arthur C. Clarke, not Huxley.
“Any sufficiently advanced technology is indistinguishable from magic.”
— entity["people","Arthur C. Clarke","science fiction author"]
Now the substance of what you’re saying is exactly right, and there’s an important refinement hidden in it.
If a world contains only boring applications of advanced tech—or equivalently, weak, non-expressive magic—then the distinction between magic and physics collapses in practice.
Not philosophically.
Not ontologically.
But operationally.
From the point of view of:
There is no meaningful difference.
Spectacle is what distinguishes magic from technology in fiction.
Remove spectacle, and all you’re left with is:
At that point, the observer’s question is no longer:
“Is this magic or science?”
It becomes:
“What assumptions about decay, friction, and failure no longer apply here?”
That is already how we treat many real technologies.
Modern readers accept things like:
All of these are anti-entropy cheats that are:
They are Clarke’s Law in its least flashy form—and therefore its most convincing.
In such a world:
No self-resetting. No conjured ammo. No violation of conservation laws.
Just:
Which is indistinguishable, in lived experience, from “magic that keeps things from wearing out.”
Because once you admit this kind of background physics change:
And—this is the real reason— it forces the author to think like an engineer instead of a myth-maker.
Most don’t want to do that work.
日本語（にほんご）
So yes:
In a world where the “magic” is only good for boring stabilization,
there is no practical distinction at all—and that’s
exactly why it’s the most believable version of the idea.