Click the green flag. Particles randomly move until touching a stationary particle. Over time particles form a tree-like fractal shape.
This is Diffusion Limited Aggregation, a simple model of a common growth process in nature. Particles randomly move (Brownian motion) and stick to other stationary particles. At the start there's only one stationary particle, a "seed." So I started with a picture of a green dot in the center. I also had one Sprite, which is yellow. That yellow Sprite makes clones of itself and each moves around, When a clone touches any green, it stops. We make clones turn green just to help show that it is stopped, so that a clone knows it isn't moving when it touches green.
