Diffusion-Limited Aggregation (DLA)

A process where particles undergoing a random walk (Brownian motion) cluster together to form aggregates of such particles. This theory, proposed by T.A. Witten and L.M. Sander in 1981, explains the formation of dendritic (branching) structures found in nature.
Examples include frost on glass, lightning paths, mineral deposits, and the growth of certain bacterial colonies.
In this simulation, wandering particles (.) spawn at the edges. When they randomly bump into the frozen structure (#), they crystallize and become part of it.