2^29 balls dropped in a strong magnetic field (and a bug?) @animations_ag
2^29 balls dropped in a strong magnetic field (and a bug?)  @animations_ag
Uploaded November 2025 | Updated September 2026, 2 weeks ago
A ridiculous number of balls are dropped and falling under gravitational exposure in an ellipse while also exposed to a magnetic field. I refer to the magnetic field as "strong" simply because the cyclotron radii are much smaller than the domain. There is a part of the video (see around 1:54) that looks somewhat unphysical, and I'm not 100% sure if this is accurate or not. It seems that a quite large chunk of particles is reflected in an unexpected way. Feel free to enlighten me with your thoughts on that.

Rendering time 17 hours. 400k time steps were computed, where each 25th frame was saved for the final video.

Music by @gpcbass. Song is called SeqU, and builds on old material from the early 90s.

Visuals in Python utilizing PyTorch and a Nilearn colormap. Frames stitched by FFmpeg.
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Alexander Gustafsson |

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

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