Da Liu relates T'ai Chi Ch'uan, an ancient Chinese form of body movement used for exercise and self-defense, to the I Ching, a series of conceptual hexagrams representing wanderer, army, revolution, retreat, etc. Together they ""allow one to discover the most precious jewel, the nature of the Tao."" The forms or movements (engagingly titled, e.g., ""Fair Lady Works at Shuttles""; ""Step Back and Repulse Monkey"") are, thank the Tao, illustrated with photos.