Each boid is a 0-sphere. Its two vectors (−1) pull it in, toward the neighbours’ centre and their heading. Its two edges (+1) push it away from anyone too close. It sees only within 60 px. The seed sets the three weights.
Tap to drop a hawk. The same ?seed= always gives the same run.
LITReynolds’ boids (1987) is a real model of collective motion. Each boid must carry 0 + 0 − 1 − 1 + 1 + 1 = 0 and stay finite, or the page throws.
AMBERAssigning the vectors to cohesion and the edges to separation is the site’s mapping.