AnimCode motion. Render it exactly.

// After John Whitney, "Catalog" (1961). One hundred and forty points sit on
// a ray; each one turns at a different multiple of the same rate, so the ray
// curls itself into a new rosette every few seconds and never repeats until
// the half turn is done.
let spin = repeat(signal: tween(from: 0deg, to: 180deg, start: 0s, end: 32s), every: 32s);
let tint(i) = if i < 35 { #f0abfc } else { if i < 70 { #fbbf24 } else { if i < 105 { #34d399 } else { #38bdf8 } } };
let dot(i) = rotate(
  angle: i * spin,
  scene: translate(x: 8px + i * 1.05px, y: 0px,
    scene: ellipse(x: -2px, y: -2px, width: 5px, height: 5px, fill: tint(i: i)))
);
let dots = map(items: range(from: 0, to: 140), transform: dot);
export let main = composition(
  width: 400px, height: 300px, duration: 32s, fps: 60fps,
  scene: stack(children: [
    scene_signal(scene: rect(x: 0px, y: 0px, width: 400px, height: 300px, fill: #0b1020)),
    translate(x: 200px, y: 150px, scene: stack(children: dots))
  ]));