Little Giant Book of Optical Tricks

Look closely at each illustrationwhat do you see? Are you sure? Don't trust your eyes too quickly, because every picture here has an optical trick to fool you. Some-times you'll find "two objects in one"; sometimes you have to rotate drawings to solve the puzzle. Among the forms of visual magic: a bird that "flies" into a cage and a boy who changes into a monkey when the page is turned upside down. More than 300 engrossing optical illusions.Kay, Keith is the author of 'Little Giant Book of Optical Tricks' with ISBN 9780806949727 and ISBN 0806949724.