How does an object sometimes have multiple shadows of varying shades yet have only 1 light source?
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Light source is a bit of a vague term. A long overhead light could be considered one light source but light is coming out of both ends and every part inbetween which could all be considered a separate source of light that will be blocked by an object differently (and thus create different shadows). Light also bounces around and reflects off things which could be relevant.
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