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Hardcover first published 1964 by Hutchinson of London. The jacket is whole, but with light edge-wear and small tears in places. The boards are clean and square, with a bump to the head of the spine. All pages are clean and unmarked. The author "advances the theory that all creative activities - the conscious and unconscious processes underlying artistic originality, scientific discovery and comic inspiration - have a basic pattern in common, which he attempts to define."