The Ultimate Book of Optical Illusions

Vertical lines appear to be bent, but are they really straight? Circles look like they cross each other, but are they actually perfect? These are just two of the imponderable color puzzles that will fascinate you for hours. Some of the illusions are so convincing, you may not realize you're being fooled until you've read the caption! 355 pages. Author Al Seckel, Sterling Publishing Co.

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