Simulations

Small worlds with simple rules, and what comes out of them. Each one runs in your browser and comes with a write-up of the science behind it.

Gravity simulator

Launch planets, throw stars, and watch binaries, Trojans and a three-body figure-eight.
Open
Cellular automata lab

The Game of Life, spiral waves, sandpiles, Langton’s ant and all 256 one-dimensional rules.
Open
Reaction–diffusion

Two chemicals, one reaction: spots, stripes, mazes and dividing cells from the Gray–Scott model.
Open
Flocking

Hundreds of birds following three local rules, and a hawk to scatter them.
Open
Double & triple pendulum

Release fifty double, triple or quadruple pendulums a billionth of a radian apart and watch them disagree.
Open
Epidemic simulator

An outbreak spreading person to person, next to the textbook SIR curve it is meant to follow.
Open