Reaction-Diffusion Patterns (2D): Gray–Scott Lab

This 2D companion runs the exact same Gray–Scott reaction-diffusion equations as the 3D version, but reads them off a flat grid instead of a lit, orbitable plane. Two virtual chemicals, A and B, share a 160×120 cell grid: A is fed in everywhere at rate F, the reaction A + 2B → 3B eats A wherever B is already present, B is removed at rate (F+k), and both chemicals diffuse to their neighbours every step at independent rates. Small changes to F and k push the system through a genuinely different family of steady patterns — mitosis-like splitting spots, coral growth, worming mazes or chaotic waves — while a live coverage and regime readout tells you which family you are looking at instead of leaving you to guess from the picture alone.