Product Description: Optical illusions trick your mind and confound your perception, and that's why these images--including three-dimensional mazes--will drive you crazy in the best of ways. Stare at a circular checkerboard closely; it will seem to pulsate and shimmer...read more

Collects optical illustions in which gray spots appear and disappear, straight lines wave, circles gyrate, and intricate patterns pulsate. (view table of contents)

Shows and describes a variety of optical illusions.

Product Description: Astounding - but real - optical illusions are everywhere! Open up this collection of fantastic optical illusions, and find moving specks before your eyes, grey spots that appear and disappear, solid objects that cannot exist, straight lines that wave and bend, circles that shake, pusating patterns - and a whole host of visual tricks that will challenge and amaze! And there are other kinds of illusions, too...read more