Horse

The settling of a debate—whether, during its trot, all four of a horse’s hooves are off the ground at the same time—led English photographer Eadweard Muybridge to develop the first photographs to capture the sequence of movement. In 1878, Muybridge arranged 24 trip-wire cameras along a racetrack. The resulting photos, The Horse in Motion, proved all four hooves leave the ground during a trot and set the stage for the first motion pictures.