This book explores how the Japanese philosopher D. T. Suzuki (1870–1966) developed an integral synthesis of Eastern and Western sources to establish a modern philosophical psychology of the "cosmic Unconscious," which he in turn used as the basis to interpret every aspect of Zen art, meditation, and enlightenment. Beyond Freud's personal unconscious and Jung's collective unconscious, according to Suzuki, is the cosmic Unconscious of Zen, which as absolute nothingness is the fountain of inexhaustible creative potentialities and the source of all Zen-inspired arts. The book demonstrates that, like the Kyoto School of modern Japanese philosophy, Suzuki's Zen endeavors to overcome the existential problem of nihilism or relative nothingness by shifting to the openness of absolute nothingness wherein emptiness is fullness and all things are disclosed in the evanescent beauty of their suchness. Suzuki, however, formulates his scheme in terms of a depth psychology where the cosmic Unconscious is the encompassing locus of absolute nothingness. Ultimately, the book argues that, by integrating both Eastern and Western views of the unconscious psyche, including the different schools of Zen and Mahayana Buddhism, as well as American, French, and German theories of the unconscious, Suzuki's Zen concept of the cosmic Unconscious constitutes a significant original contribution to philosophical psychology.