Pictures can ‘run’ only because our eyes cannot register more than 20 pictures per second. If we see more than 20 pictures, they look very similar but differ only in minor things; our brain perceives them as moving. Flip books or cartoon films work on this principle. The movements could not be recorded with cameras for a longtime because the exposure times were too long. The first serial photography succeeded in 1872. The British photographer Eadweard Muybridge captured a running horse with 30 cameras. He mounted the finished pictures on a disc, which was rotated in a device. Through a viewing hole you could see a running horse. Later individual photos were recorded with just one camera on a single film. This was the birth of the cinema.
