Book excerpt: "An unparalleled exploration of the art of cameraless photography, Geoffrey Batchen's Emanations offers an authoritative and lavishly illustrated history of photographs made without a camera. The book reveals the myriad approaches that artists have employed to create photographic images using only a light-sensitive surface and a source of radiation. Looking back to the invention of photography in the early 19th century up through recent cameraless works by contemporary artists, Emanations tells the story of nearly 200 years of bold experimentation in photography."--Provided by publisher.