game.censer — the brass censer: burning aromatics, a column of smoke, and the charcoal that pays for it. Part of the TRAVERSE slice. A swing lays a stack of puffs in front of the doctor and slightly above him. The smoke RISES, and anything standing inside it rises with it — including the doctor, which is what turns an instrument of medicine into a way up a wall with no handholds. It costs charcoal (`NB.state.charcoal`), and charcoal comes back only at a brazier. WHAT OTHER SLICES READ NB.ext.smokeAt(x, y) -> boolean is that world point inside live smoke? The rounds slice asks this to know which infected should be recoiling. NB.ext.censer.puffs the live puff list, read-only WHAT IT LISTENS FOR "brazier" { x, y } the doctor is at a lit brazier; charcoal refills for as long as the pulses keep arriving, so it works whether the city emits it once or every frame. WHAT IT EMITS "puff" { x, y } a swing landed The visual is `censerSmoke.shader` beside this file: one quad per puff, no texture, the whole billow and its dissipation computed in the fragment shader from `age` and `seed`. Each live puff holds its own RUNTIME material (`renderer.material.create`, which needs no VFS write and so works in play mode) drawn from a fixed pool, so the smoke costs a handful of draw calls and nothing else.