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Anonymous
shutter travels from top to bottom. the whole scene is not exposed at once.
The farthest point of the rotor, being at the top of the frame, was exposed first. as the shutter slid down, the rotor moved. However, the 'inside' part of the rotor does not move "as much" as the 'outside' part of the rotor, resulting in the curved, parabola like shape the picture has.
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