About the Book: In Hallucinations, acclaimed neurologist Dr Oliver Sacks explores the fascinating science behind experiences that seem to defy reality. Drawing on compelling patient stories and his own experiences, Sacks examines hallucinations caused by sensory deprivation, illness, injury and altered states of consciousness. He explores their connections to religious visions, out-of-body experiences, folklore, art and the structure of the brain, revealing why the capacity to hallucinate exists within us all. Insightful, compassionate and thought-provoking, this landmark work offers a fascinating exploration of perception, consciousness and the mysteries of the human mind.