The Great Book of Optical Illusions

It is said that "seeing is believing." But what if the picture you see is hard to believe? Maybe it appears to be something else entirely.

In The Great Book of Optical Illusions, Al Seckel brings together a collection of fascinating visual puzzles and enigmatic designs that make the viewer wonder: How does this work? What does it really contain?

From collections of baffling shapes that defy the viewer to work out the hidden figures, to dazzling patterns that appear to change on the page, here are optical illusions found in classical art and through history to the most modern of visual tricks.

There are more than 280 color and black and white illustrations in the book, from Illusionworks, the world's leading brand of illusion artworks.

Al Seckel, formerly of the California Institute of Technology, is a leading authority on visual and other types of sensory illusions. His earlier work, The Great Book of Optical Illusions garnered rave reviews, and sold nearly 100,000 copies. He is the author of over 15 books on this subject, and has lectured extensively at many of the world's most prestigious universities. He also designs interactive galleries on illusions and perception for science museums across the country and around the world. Seckel writes an illusion column for National Geographic Kids magazine.