Gray–Scott reaction·diffusion terrarium
Two virtual chemicals react and diffuse across a petri dish on your GPU. Where activator outruns inhibitor, leopard spots, coral fans, labyrinths and waves crystallize out of noise — the same mathematics behind animal coats and growing coral.
Paint on the dish to seed new growth. Shift-drag (or Erase mode) wipes chemical away. Drag the background to orbit, scroll to zoom. Nudge Feed / Kill to explore the pattern space — if the dish dies, hit Seed.
| Drag on dish | Paint seed chemical |
| Shift-drag | Erase |
| 1 – 6 | Pattern presets |
| Q | Cycle palette |
| Space | Pause / run |
| E | Toggle erase mode |
| R / C | Reseed / clear dish |
| A | Auto-tour presets |
| [ ] | Brush size |
| P | Save PNG snapshot |
| M | Mute audio |
| H | This help |