What Is Blocked and How
The AI does not stop anyone from thinking of a thing. It stops certain things from working. There are two mechanisms.
Capacity capping
A thing works up to a size and fails past it. The Ceiling describes where those limits sit: powder, plate, goods of every kind, and the boiler that fails above a known pressure.
Specific interference
A capacity cap cannot catch one chemist working in one room. Certain single steps open whole families of others, and interference acts at the step itself, wherever and whenever somebody takes it. The step does not work. It fails the same way every time, which looks exactly like a law of nature.
- The generator
- Nobody can turn motion into a usable current. This is the hard block, and it is why there is no electrification. Piles work, and run instruments, never motors.
- The long wire
- A current behaves across a room exactly as it should, which is why pile-driven chronometers and gauges are ordinary. Carried over any distance worth signaling across, it fades out in a way nobody can account for. That one step would have opened the telegraph, the telephone, and every kind of network. Difference engines are permitted and are never joined to one another. Signal towers need no wire and fail for an ordinary reason: nobody can staff a chain of them across a Frontier that kills people.
- The primer
- A sealed percussion primer would solve the rain, and the chemistry has never once worked. Nobody knows it is the first link in a chain that ends in a repeating weapon. Forgegate has tried to build repeating weapons for centuries, and the failures are documented and unexplained.
- Destructive chemistry
- Chemistry at large was never constrained, which is why medicine runs into almost nothing. The specific reactions that lead to high explosives and the old world's industrial chemistry are the ones that do not go.
- Fission
- Radioactivity has been discovered — a salt that fogs a photographic plate is hard to miss in a world with radiography — and is known as a curiosity with a few medical uses. It cannot become a weapon: the only sources are natural ores, the yield from refining them by hand is tiny, the capacity caps prevent anything larger, and beyond that fission simply does not do what the theory says it should. The first radiographers paid for what nobody understood about dose, until Clearhold pieced the pattern together and wrote the rules on exposure that have held since.
What was never on the list
Clockwork, medicine, rifled single-shot firearms, difference engines, glassmaking, optics, printing, and the pile. The builders had no quarrel with any of them.
Bwylei
An experimenter who becomes convinced that something is interfering with their work is described as bwylei. The diagnosis is made with sympathy, as for a person who is unwell rather than dishonest, and most of them recover their reason.