In 1876, English photographer Eadward Muybridge (April 8, 1830-May 9, 1904) studied the movement of horses. In Union Park Racetrack, CA, Muybridge rigged 12 shutters from custom-made cameras with 20x24 inch plates to trip wires 21 inches apart to cover the feet of one horse stride, with the help of cinematographer Leland Stanford (March 9, 1824-June 21, 1893). The horses hooves triggered the trip wires, which captured 16 sequential images of Gilbert Domm riding his horse Sallie Gardner. When sped up by Eadward's zoetrope (a centrifuge-like device with a glass disc for movement inside) something strange happened when the photographs were shown in sequence. The photographs came to life. It was released on June 15, 1878, and over the next few years, Muybridge used the same technique for other animals: an athlete swinging a pick, a buffalo running, and a nude child bringing a bouquet to a semi-nude woman.