The horse landed on several feet while running.

After one or three turns, the film was still made like this.

1872 One day, in a hotel in California, Stanford and Cohen had an argument about whether the hoof touched the ground when the horse was running. Stanford thinks that a horse runs so fast that its hoof should fly at the moment of jumping, but Cohen thinks that if a horse's hoof can fly, won't it become a frog? There should always be a hoof on the ground. The two men were at loggerheads and flushed, and no one could convince anyone.

So the two invited the British photographer McBride to be the referee. McBride couldn't figure it out, but the photographer was a photographer after all and still had some ideas. He put 24 cameras at the same distance along a runway, aiming at the runway; On the other side of the runway, 24 stakes were nailed to corresponding points, and thin wires were tied to the stakes, which passed through the runway and connected to the camera shutter.

Everything is ready. Mcbride let a horse run from one end of the runway to the other. When the horse ran, it tripped over 24 thin threads in turn, and the camera took 24 photos in a row. There is little difference between two adjacent photos. The photo shows that the horse always lands when running, and Cohen wins.