Hourglass billiard @animations

Uploaded July 2023 | Updated September 2026, 2 weeks ago

Ball/ray moving and elastically bouncing in a domain reminiscent of an hourglass. Pretty useless for being an hourglass though.

Song made by @gpcbass, used previously on this channel.

Visuals in Python & FFmpeg.

2^28 balls constrained by gravity and a W

$Fractal emerging from chaos in a circle Shown is a ball bouncing in a circle under gravity for many start positions. The sixth bounce is associated with a color of the circle for colouring a pixel representing the start position. For a relatively high pixel density, the resulting image becomes a fractal. In the very end, a corresponding image for 10 bounces is shown, indicating, unsurprisingly, a more chaotic behaviour. Music by @gpcbass! The song is called Cayenne.$

Symmetric chaos by 2^27 particles dropped inside an ellipse

Increasingly sized cubes of interacting balls dropped on flat surface

2^29 balls dropped in a strong magnetic field (and a bug?)