ers of this incredible, colorful collection are hundreds of the world's most powerful optical illusions. They're beautiful to behold, and stunning in their trickery. Some of the mind-boggling images seem to spring into action, vibrating, pulsing, and spinning like a hula hoop. Other ambiguous illusions feature two subjects in one: the fun is in finding them both in the single picture--including a mouse playing hide and seek in a cat's face and a strange desert mirage where palm trees imperceptibly morph into camels. And still more, like "The Impossible Terrace," which couldn't exist off the page: just try to figure out if you're viewing the space from above or below. Every one is astonishing.