A standard trick for illustrators or cartoonists who want to make a vehicle appear to be going fast is to show the tires as ovals leaning forward. This illusion of speed originated with photos of cars taken with old-fashioned cameras with a "focal plane shutter." In this type of camera, instead of the shutter opening from the middle of the lens, the shutter traveled from one side to the other to let light in to expose the film. Wheels looked like they were leaning forward because the car was moving, and as the left side of the car was done being photographed, the right side was still being exposed as the car was further down the road.
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