A Little Giant (R) Book: Optical Illusions  (English, Paperback, Kay Keith)

Bats and birds that look like faces, skulls that pop up on anything white, three donkeys with three ears between them, and, walls that disappear - relax, they're only optical illusions. Examine thousand-year-old drawings, find out about closure, perspective, "the Rubin vase" and how these tools can untangle the tricks found in this volume. This book is a fascinating, visually arresting title, which will keep the kids quiet for hours.