Muybridge made a bet that a running horse had all four hooves off the ground at the same time on occasion. To win this bet he had to invent a better shutter and other apparatus to capture a series of images, one of which, he hoped, would win his bet. Taken together, those series of still images somehow represented motion. Inadvertently, he invented the core concept of the motion picture, for which we all thank him.
In a way, these are heir to Muybridge.
I still haven't figured out how to get the moving objects' shadows to look natural. Things also got difficult inside the bicycle wheels.
