After photographer Eadweard Muybridge visited Thomas Alva Edison to show him zoopraxiscopic images—that is, images that follow one another rapidly and leave the impression of movement on the retina—Edison went on to invent the Kinetograph and the Kinetoscope: “an instrument that does for the eye what the phonograph does for the ear.” Twenty-five exposures per second for twenty-eight minutes, for a total of 42,000 images.
