Does the presence of a shadow preclude the existence of the object?

Question: Keep in mind that a shadow is merely the absence of light and therefore does not exist. Can a real object be determined by something that is unreal?

Answer: Yes. A shadow is something. It is a signature of light absorption by the object. One does not require mass to be something. Is a thought unreal? How about speech? A vacuum is the absence of all matter, but a vacuum in quantifiable.

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