With the dynamic interactive Optical Illusions, each time readers turn the page, lift the flaps, or pull the tabs, they'll be confronted with an even more amazing optical illusion! This guide to the world of eye-tricks is fun for the entire family {u2014} providing new and gasp-inducing moments on each page. Along with the illusions, which include a spinning thaumatrope, a stereoscope, and an entrancing 3D sculpture that "follows" you around the room, readers will welcome learning the latest theories about why illusions fool us.