A procedural art piece done in Flash back in the AS2 era. It's pretty rough — I was only just learning how to code. Here's how I described it at the time:

There's less than 2k of data in this "animation" (1608 bytes). The shapes are based on sequences of prime numbers. It will never repeat itself, and the longer you watch it the more curiously it will behave. There are no ready-made drawings here, everything is generated on-the-spot by various mathematical formulae. The animation is rather smart, and will adjust the complexity of the drawing to make sure it runs at a reasonable speed on your computer. That said, it looks better on a faster computer. Just saying... There are 2 modes to this thing. I won't tell you how to switch modes, because the other mode is kinda dumb and I should have pulled it out. It's pretty easy to figure out.

Adorable, innit.