Reaction-diffusion on a rotating surface — self-organizing morphogenesis
Gray-Scott reaction-diffusion model: ∂u/∂t = Duδ²u - uv² + f(1-u), ∂v/∂t = Dvδ²v + uv² - (f+k)v. Different parameters produce stripes (zebra), spots (cheetah), coral, or maze-like patterns — the same mechanism that generates animal coat patterns (Turing 1952).