Saw an image on Tumblr that had me curious... what makes the spiral effect?
Inspiration: [url]http://beautyandthemaths.tumblr.com/post/89959942948[/url]
Gifs at: [url]http://mathhombre.tumblr.com/post/89990751944/dot-disc-inspired-by-that-second-image-from-the[/url]
