This book conveys something of the jubilant mood of the modern physicist as he grapples with anti-worlds, helical structures and molecular spin. It all begins with mirrors: the author uses his knowledge of mirror images to survey the fantastic world of left and right in nature and science. In an argument touching poetry, music, art and even magic, he shows what polarity and its problems have to contribute to our knowledge of the origins of life, of the fourth and fifth dimensions, of anti-matter and also of the difficulties of communicating with other galaxies. The author also wrote Mathematical Puzzles and Diversions and Mathematical Magic Show.