One of my interests is these things called ideal knots (and links) about which I’ll write more later, no doubt. Anyway, I recently slammed together some code and scripts to produce raytraces of them spinning. Here’s the two component link 7.4, spinning. The colours indicate curvature, by the way.
Incidentally, this is an animated GIF, which sucks somewhat, since GIFs are limited to 256 colours, as well as being politically incorrect. Anyone out there know of command-line UNIX tools that will produce moving images with 24-bit colours from a set of frames?