The ancient yin-yang symbol was chosen by SIECUS as its official emblem. According to ancient Chinese tradition, yin represents the passive feminine principle in nature, which is exhibited in darkness, wetness, evil, and death; yang, the active masculine principle, is exhibited in light, dryness, good, and life. The union of the two is said to produce all that comes to be.— The symbol itself dates back at least to the fourth century B. C., and has been identified with the Eastern philosophical religions of Confucianism, Buddhism, and Taoism. In the Western world it has long been adopted into the symbolism of myth, magic, astrology, and witchcraft. In each case it represents a man-centered natural universe made up of male and female principles with no place for God.