click / drag — infect a patch space pause R randomise C clear
1–6 presets [ ] speed P palette X random params
k1 / k2 / g / N sliders live in the panel, top right — drag any of them for a morphology none of the six presets hit.
Gerhardt–Schuster hodgepodge machine, Physica D 36, 1989. A cellular automaton that spirals like a Belousov–Zhabotinsky dish.