Book excerpt: An in-depth examination by Dr. Colin Kageyama of how and what fish see. This important book will help all anglers to design better flies and lures by its explanation of the physical processes of light in water and consequently how colors change and are perceived by fish in varying conditions of depth, turbidity, and light. Excellent illustrations by Vic Erickson and color plates that show startling color changes. This book will change the way you fish!