Why do we need two eyes? Why are all cats grey at night and appear to move faster the day? Why is the sky blue and the setting sun red? This book explains the m

It looks so easy. Open your eyes, and immediately there is a world of objects in glorious Technicolour. It takes no time or effort - perception just happens. Or

In this volume, originally published in 1978, the authors survey the historical and contemporary research literature pertaining to two-dimensional visual-geomet

Cognitive Illusions explores a wide range of fascinating psychological effects in the way we think, judge and remember in our everyday lives. In this volume, R�

Kids can be both scientists and magicians--all at once! With just a little practice, and these 50 super experiments, they’ll amaze people with fool-the-eye il