Now You See It, Now You Don't: The Amazing World of Optical Illusions by Seymour Simon (Paperback)

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This classic book on optical illusions explores dozens of visual riddles about distance, depth, brightness, contrast, and color. Newly designed and filled with more than eighty illustrations -- plus eight full-color pages of optical illusions -- Now You See It, Now You Don't lets youngsters see for themselves why they can't always believe their eyes!