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Seeing how we see has been a problem since earliest times, which modern science tackles using physics, physiology and psychology. Brian Wandell has set out to provide an understanding of the vision scientist鈥檚 tool kit and what it has revealed so far (Foundations of Vision, Sinauer, 29.95/$45.95, ISBN 0 87893 853 2). The book, which has been tested out on students at Stanford University in California, is packed with clear diagrams, accompanying a text that tackles in turn the three visual processes of encoding, representation and interpretation.