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The Little Giant Book of Optical Tricks
     

The Little Giant Book of Optical Tricks

by Keith Kay
 

Look closely at each illustration—what 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”

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