Tibetan Buddhist writings frequently state that many of the things we perceive in the world are in fact illusory, as illusory as echoes or mirages. In Twelve Examples of Illusion, Jan Westerhoff offers an engaging look at a dozen illusions--including magic tricks, dreams, rainbows, and reflections in a mirror--showing how these phenomena can give us insight into reality. For instance, he offers a fascinating discussion of optical illusions, such as...