Clinical psychiatrist Ethel S. Person explores the important inner world of fantasy in this book, along with daydreams and reveries. The author draws upon years of clinical experience to illustrate how fantasies as "self-generated fictions" help organize our lives, shape our behavior, and serve as an adaptive survival tool. Person excels in her descriptions of generative fantasies (rehearsals of the future) and shared fantasies such as paramilitary cults. Person connects daydreaming and reveries to imagination and spells out their important link to creativity. By Force of Fantasy is a fascinating look at a subject that has been undervalued and overlooked in psychology.