Wait, 301 Bounces Turned This Box Into A Rainbow 😳 | 8 Simulations, 8 Rainbows

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Eight simulations, and every one of them ends as a rainbow: a shrinking box that leaves 301 coloured ghosts of itself, 1,112 drops of paint flung into a spin-art swirl, a ring of 7,155 beads fed inward into a vortex, 576 people riding lifts up through floors that turn to colour, a disc sliced into 720 colour pieces, 220 cars parking row by row, magnetic beads that snap into a closed rainbow ring, and 1,056 tiles that spiral into an eye. Every move plays a note. No talking.

How a few of them work: in the box chapter every bounce shrinks the box a little and the old outline stays behind as a coloured ghost; the bounces play In the Hall of the Mountain King (public domain), note by note. In the disc chapter a ball bounces around and every bounce cuts the disc along its path. The lifts, the parking lot, the vortex and the tiles follow a fixed schedule instead of free physics, and are timed so each chapter finishes in about 40 seconds. All code and sounds are original; the melody is public domain.