River of Shadows: Eadweard Muybridge and the Technological Wild West is a 2003 book by American writer Rebecca Solnit, published by Viking; in the United Kingdom it was published by Bloomsbury as Motion Studies: Time, Space and Eadweard Muybridge. The book is a biographical portrait of photographer and inventor Eadweard Muybridge, a history of the development of technological change in the West during the later half of the nineteenth century that led to development of the modern film industry in Hollywood and later the information technology industry in Silicon Valley, and an essay focusing on a series of connections between Muybridge's life and the changing human landscape of the American West.