"When I paint green, it doesn't mean grass; when I paint blue, it doesn't mean sky."

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The word "Blue" does not mean the sensation caused by a gentian on the human eye; but it means the power of producing that sensation: and this power is always there, in the thing, whether we are there to experience it or not, and would remain there though there were not a man left on the face of the earth.

— John Ruskin