11 Satisfying Simulations That Find Perfect Order

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Eleven simulations, and every one of them ends in a clean, finished picture: a jar that fills with 131 jellies in rainbow order, a prism that paints a full spectrum, a circle of 433 pegs that turns into a colour wheel, a pipe board filled edge to edge, a window that wipes itself clear, a bucket of balls flung up a ladder, a hot-air balloon solved out of number clues, an aqueduct that carries water, a pendulum that closes a star, a sun-lens burning a sailboat, and a quilt sewn patch by patch. No talking.

The promise is the same every time: each chapter starts messy or empty and stops when the picture is finished. The counter under the chapter title is the count from the simulation in that frame, and a chapter winds down a few seconds after its goal is reached.

How it was made, honestly: the nonogram is solved by a real line solver, which lists every way a row or column clue could fit and fills only the cells that agree in all of them, and the chapter plays those decisions back faster and faster. The jelly jar is a soft-body physics run. Several of the other chapters (the quilt, the aqueduct, the bucket ladder) follow a fixed timetable so they finish in time, and the pipe board replays a solution made when the board was generated rather than searching for one. The pendulum uses the small-swing formula with the Earth's turn sped up. The rules, the code and the sound are original.