Movers and shakers

"Something that's been printed on paper can't possibly be able to move, right? Because of how our brain works, though,it's possible to create images that seem to move or shake. On every page of this book, readers can test out different optical illusions while learning how they work. Facts boxes add . . . details about how the human brain deals with certain kinds of art, images, and see the world around us to create optical illusions"--Provided by publisher.