https://gfycat.com/enchantedclearcutblackfish

This is one of the best optical illusions I’ve ever seen: aside from rotating, these circles don’t move. The left/right/up/down arrows were freaky enough but the in & out arrows really blew a gasket in my brain. For proof that the circles don’t move, blink your eyes quickly as you watch[…]

More: Rotating Circles Optical Illusion