You have to try this! Robert J. Wright says it's called 'Persistence of Vision' and he learned it in Physics classic at Jesuit High School in 1969. His teacher was Father Bradley if that rings any bells?!?!? I can't believe HE remembers that far back! But seriously, this optical illusion is WILD!!! Totally freaked me out! And I promise, nothing crazy will jump out of the screen at you! Click here to get started and make sure you have a blank wall or piece of paper ready to go!