Imagine swinging a ball on a string around a lamp. Consider the speed of the shadow on the wall compared to the ball. Every time the ball goes around the light, the shadow crosses the entire length of the walls. The speed of the shadow is related to the speed of the ball and the distance that thw shadow is projected. If the ball is going 10 feet per second, and the wall is 5 times as far from the lamp as the length of the string, the shadow would move 50 fps. If you extend the walls out infinitely far, the shadow “moves” infinitely fast.
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