Chromafield

A Gray-Scott reaction-diffusion membrane grows on the GPU in electric violet. You deposit reagent into it with an arm sweep or a pointer drag, and your arm-span slides its chemistry between spots, stripes, worms and chaos. The emergent pattern is reduced on the GPU and read back to conduct one of Karel's real piano takes: a mature, ordered membrane plays it clear; a churning one smears and resonates it.

Fully playable with the mouse alone — drag to deposit, ← / → to shift the regime. Allow the camera to grow the membrane with your body instead.