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Simone de Beauvoir -- The Ethics of Ambiguity (amazon)

Carl Gustav Jung -- Memories, Dreams, Reflections (amazon)

Carl Jung, Richard Wilhelm -- The Secret of the Golden Flower: A Chinese Book of Life (amazon)

Robert Moss -- Sidewalk Oracles: Playing with Signs, Symbols, and Synchronicity in Everyday Life (amazon)

Brian Sutton-Smith -- The Ambiguity of Play (amazon)