Without any sort of introduction, here’s the video I’m going to be discussing. Even without any explanation, it’s beautiful to space out and watch.

This video depicts modular multiplication on a circle. That is, I’ve taken a number line (in this case, from 0 to 500) and wrapped it around the outside edge of the circle on the screen. Then, for every point on that circle, I drew a line from its position N to the position N*t mod 500 where t is some function of time. In extremely unmathematical terms, this produced a pretty swirling picture.

Here’s the code to reproduce this effect for yourself: https://gist.github.com/Aearnus/ba8f1b6b5d0e7736e796.