Horse and rider galloping, Muybridge motion study, 1880s. These photographs were obtained by English photographer Eadweard J. Muybridge (1830-1904) in his pioneering work documenting the motion of humans and animals. Between 1883 and 1886, Muybridge made more than 100,000 images using his ground-breaking stop-motion photography techniques. He worked in Philadelphia under the auspices of the University of Pennsylvania. The results were published in 'Animal Locomotion' (1887).