The famous Rotating Snakes illusion
I was in the subway yesterday when the repeating pattern of concrete blocks started messing with my head. I did a little research later, but couldn’t find anything about the illusion I experienced (probably because I can’t describe it well enough to Google it).
So I’ll just pass on this link from Dark Roasted Blend, collecting some of the best visual illusions out there. You’ve probably seen a few of them, like the rotating snakes, but I doubt you’ve seen all of them. (My favorites are the ladybugs and the spinning dancer.)