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In some representations the serpent is shown as half light and half dark, echoing symbols such as the Yin Yang, which illustrates the dual nature of all things, but more importantly, that these opposites are not in conflict. The serpent or dragon eating its own tail has survived from antiquity and can be traced back to Ancient Egypt, circa 1600 B.C.E. From there it passed to Phoenicia and then to the Greek philosophers, who gave it the name Ouroboros ("the tail-devourer"). The ouroboros has several meanings interwoven into it. Foremost is the symbolism of the serpent biting, devouring, eating its own tail. This symbolizes the cyclic Nature of the Universe: creation out of destruction, Life out of Death. The ouroboros eats its own tail to sustain its life, in an eternal cycle of renewal. In the above drawing, from a book by an early Alchemist, Cleopatra, the black half symbolizes the Night, Earth, and the destructive force of nature, yin. the light half represents Day, Heaven, the generative, creative force, yang.....read more...