field equation
Every interaction adds a term to a visible equation; reaction, diffusion, advection, collision, and oscillation evolve into a world the visitor composed indirectly.
surface
A simple field and a short readable equation begin in equilibrium.
disturbance
Touch does not paint. It adds or changes terms—sources, diffusion, curl, oscillation, collision, decay—and the renderer integrates their consequences.
recognition
The evolving image is the history of a mathematical system being authored one rule at a time.
system
Reaction-diffusion, vector advection, SDF collision, harmonic terms, bounded numerical integration, and optional AI explanation/mutation only on request.