Notices by James Brown (ancientjames@mastodon.social), page 6

Inaction shot.

A quirk of these LED matrix panels is that they simultaneously update two rows at once, separated by half the panel. So on a 64x64 panel, you update rows 0 & 32, 1 & 33, 2 & 34 etc.
However, if you want to sweep one around an axis, you ideally want to update the outer LEDs at a faster rate than the inner ones, and this layout prevents that.

The Ring of Power from Harry Potter.

You can even plug a USB keyboard into it and play it.

I posted a video of one of my bricks streaming a low quality video of Doom a while back, but it turns out I never showed one doing it for real here.