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Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

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Detailed Solution

The "shadow" is the dark patch formed behind an opaque object exposed to light.

Here consider a cylinder.

If the top or bottom surface of a cylinder is held towards the light source then we get a circular shadow.

If the curved surface of the cylinder is held towards the light source then we get a rectangular shadow.

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