Walking horse. High-speed photographic sequence of a walking horse (Equus caballus). This sequence, by the British-American photographer Eadweard James Muybridge (1830-1904), was published in the book Animal Locomotion (1887). The action runs from left to right starting at the top left. Muybridge pioneered the use of high-speed photography and employed ingenious techniques to analyse animal and human locomotion. He began his work on high-speed photography when he was commissioned to discover whether galloping horses have all of their feet off the ground at certain times. He proved that they did.