Where do creative people get their inspiration? Guy Claxton, author of "Hare Brain, Tortoise Mind" has a theory: according to him it comes from a combination of inspiration and evaluation, "of being able to let an idea come to you and then crafting it into shape." Claxton talks of the intuitive understanding creative people have, of the importance of alternating work rhythms with reverie, of knowing in his words, "when to get down to hard work and when to put a problem on the back burner and leave the subconscious to mull it over." Says Claxton, in this thought-provoking article, "Time out feeds the quietness of mind that is essential to creativity."