As more and more small white dots are added to this black and white checkerboard in arrow patterns, your eyes are automatically drawn towards its centre and you'll start to start to think it looks warped. But it's not. Excuse me while I go vomit.
All those connect-the-dot puzzles I did as a kid must have done more harm than good. I can't even imagine the havoc that colouring inside the lines has wreaked on my psyche. [YouTube]