I have no idea who created this (Google Image Search just yields a bunch of unattributed Tumblrs) but it's cool:
By my eye, it looks like each dot travels along each diameter on a sinusoidal projection, and I guess it wouldn't be hard to prove that by offsetting each wave by 45 degrees you'd end up with a circle. Still, I'm not going to try, and instead just enjoy the animation. Woo.
That's all for this week — have a great weekend!