Eadward Muybridge was a pioneering photographer who helped advance motion pictures. In 1878, he captured a series of photographs of a galloping horse that proved horses lift all four hooves when galloping. This was one of the first instances of stop-motion photography and helped inspire the development of motion pictures. Muybridge faced legal issues after murdering his wife's lover, but was acquitted for justifiable homicide. He went on to take many sequential photographs of humans and animals in motion.