The Art of Creative Thinking by John Adair is a guide to developing creative thinking skills. The book explores various techniques for generating new ideas, such as using analogies, making the familiar strange, widening your span of relevance, and practicing serendipity. Adair also emphasizes the importance of observation, listening, and keeping a notebook. He further introduces the concept of the "Depth Mind," a model of the unconscious mind's creative processes, and offers techniques for tapping into this resource. Adair stresses the need to suspend judgment, tolerate ambiguity, and trust the power of inspiration. He concludes with a call to apply these creative thinking principles to all aspects of life, including personal growth and self-discovery.