eli5: Our eyelids are a reddish colo(u)r but why do we see black when we close our eyes?

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eli5: Our eyelids are a reddish colo(u)r but why do we see black when we close our eyes?

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Because there’s no light that gets in to reflect any color. Just like if you held a green piece of cloth to cover your whole eye, it would be black because there’s no light.