7 Most Satisfying Physics Simulations (One Bass Ball Left After 511 Merges In A Square Box) 🌈

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Photosensitivity: no full-screen flashes (measured frame by frame). A few tiny spots, never more than 4 of about 1,300 screen cells, flicker up to 4 times a second at 0:04-0:06 while the first balls merge, and briefly at 2:02 and 2:49.
512 small balls bounce around a square box, off the four walls and off each other. When two balls of the same colour touch, they merge into one bigger ball of the next colour, and one of the nine keys under the box lights up and plays a lower note. The counter beside the picture climbs from 0 to 511 merges, and about 36 seconds in the last two balls meet: one bass ball, which then swells to show its nine colour rings.

Then six more rules, each one running until it is done. One ball ricochets inside a ring of 100 grey arcs and paints each arc it lands on in that arc's own colour, until the 100th bounce closes a full colour wheel. A ball in a triangle turns into four at every wall hit; 273 hits later there are exactly 820 balls, and they settle into a stacked triangle, red at the top to violet at the bottom. A triangle gains one side and one higher note at every bounce, 45 bounces until 48 sides look like a circle. A ball falls on eight slabs of ice, each one thicker than the slab above; four hits break a slab, and the 32nd hit opens the rainbow core. Cells divide inside a round dish and every division pulls the wall in a little, until 100 cells pack it. Last, digits 1 to 9 are written into a kakuro grid one cell at a time, always where the fewest digits still fit, until all 81 white cells are filled and every clue adds up.

No talking. The number beside each picture is the simulation's own count at that moment, and each chapter shows its rule on screen and runs without cuts.

What is real and what is planned? In the first chapter the balls really bounce off the walls and off each other, and a merge adds the two areas and keeps the momentum, computed frame by frame. To finish on time, all balls share one planned speed, and once fewer than about 200 are left each ball is steered gently toward the nearest ball of its colour; the last ball's swell to the walls is an animation, not physics. A note plays at most about four times a second, so not every merge is heard, but every merge lights its key. The rules, the code and the sound are all original.