Puzzling Optical Illusions (Dover Children's Activity Books)

Here is a delightful collection of mysterious optical illusions — pictures that play tricks on the eye and baffle human perception. Some of these images are the result of shortcomings in our vision; others are still not completely understood. This book contains a rich assortment of these visual mind-bogglers, including "impossible objects" — constructions that look fine on paper but cannot possibly exist in reality — as well as pictures that suddenly change into other configurations as you're looking at them. Straight lines, for example, wave and bend before your eyes; gray spots appear and disappear; patterns pulsate and vibrate, and much more.
The visual surprises and mysterious effects found in this book will especially delight youngsters, but readers of all ages are sure to have fun with these perplexing optical effects. An ideal companion for long car trips, Puzzling Optical Illusions will also be a source of stimulating entertainment at parties and get-togethers or during quiet times at home and school.