It spins! The sprite clones itself a few times. Each clone draws a half circle with a larger radius, that spins at a slightly larger speed, to create this pretty effect. Feel free to play around with it!
Just playing around with an animation shared by Jens made in Snap [1], somewhere on twitter before that [2], and maybe somewhere else but I have no idea where it came from :) [1] http://snap.berkeley.edu/snapsource/snap.html#present:Username=jens&ProjectName=Mesmerize [2] https://twitter.com/randal_olson/status/633821517218844672
