Bly was influenced by the Swiss psychiatrist Carl Jung who developed the theory of archetypes , the discrete structures of the Psyche which emerge as images in both art and myths. The Powerful King, the Evil Witch and the Beautiful Maiden are, according to Jung, imprints of the collective unconscious and Bly wrote extensively about their meaning and relations to modern life. As an example and in accordance with Jung, he considered the Witch to be that part of the male psyche upon which the negative and destructive side of a woman is imprinted and which first developed during infancy to store the imperfections of one's own mother. As a consequence, the Witch's symbols are essentially inverted motherly symbols, where the loving act of cooking is transformed into the brewing of evil potions and knitting clothes takes the form of spider's web. The feeding process is also reversed, with the child now in danger of being eaten to feed the body of the Witch rather than being fed by the mother's own body. In that respect, the Witch is a mark of arrested development on the part of the man as it guards against feminine realities that his psyche is not yet able to incorporate fully. Fairy tales according to this interpretation mostly describe internal battles played out externally, where the hero saves his future bride by killing a witch, as in "The Drummer" ( Grimms tale 193 ). This particular concept is expanded in Bly's 1989 talk "The Human Shadow" and the book it presented.