Abstract
The Warring States and Ch'in-Han periods witnessed not only an efflorescence of cosmological speculation but along with it the growth of intricate systems of divination, astrology, geomancy, and magic. The internal structure of the cosmos, elaborated in terms of Yin-Yang and Five Phase theories, was treated as something which could be manipulated to the advantage of a person who was initiated into the secret operations of the universe. Thus the Yin-Yang and Five Phase cycles, the trigrams of the Book of Changes, the sexagenary cycle of Celestial Stems and Earthly Branches, as well as various calendrical and astronomical observations, all served as the raw material for a diverse array of esoteric arts.
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