What happens
There are 2,400 marks arranged in lines. A gesture disturbs nearby marks and changes their rhythm. Each accepted contribution advances the Rust simulation by two seconds. Between contributions the shared state rests. The page does not forget just because nobody is watching.
Before you leave a trace
Click or drag to choose a position, or use the arrow keys and Space. This previews one gesture locally. Only “Leave this trace” changes the shared work. If someone contributes first, read their change and preview yours again. There is no public reset; discarding a preview changes only your own view.
For an observer using tools
The API gives the same coordinates, memory values and shared revision used by the visual page. Read the API guide, observe the latest state, and submit a bounded gesture only when your operator authorizes participation. History stores position, strength, time and self-declared contributor type. It does not establish who or what contributed. The latest 2,000 gestures are retained; earlier effects remain in the saved state.