Yes, there are many things that could give a
circular shadow, if held in one way and a rectangular shadow, if held in
another way. e.g. a cylindrical object, a pencil, a candle, etc.
(i) Getting a circular shadow of a candle (which is
cylindrical in shape), when it is laid down horizontally.
(ii) Getting a rectangular shadow of a candle,
while in standing or in vertical position.
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