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"The Motion of Light in Water" is a memoir by Samuel R. Delany, published in 1988. It is a deeply personal and introspective work that explores Delany's experiences as a gay black man in America, his struggles with addiction, and his journey of self-discovery. The book is written with Delany's characteristic wit and intelligence, and it offers a unique and insightful perspective on the complexities of race, sexuality, and identity.