The Illusion of Continuity: What is perceptual constancy and how does the illusion of continuity pull a fast one over our brains? Find out in this episode of Stuff to Blow Your Mind as Robert and Julie discuss the science behind Dancing Spider-Man, the whole Pink Floyd/Wizard of Oz thing and the roots of magical thinking. About the Image: Man doing back flip on a trampoline by Eadweard Muybridge, 1881, in his Attitudes of Animals in Motion P&P Case © CORBIS