But what do you mean by “redness exists”? My watch exists, if it hasn't been pulled to pieces, if it hasn't been destroyed. What would we call “destroying redness”? We might of course mean destroying all red objects; but would this make it impossible to imagine a red object? Supposing to this one answered: “But surely, red objects must have existed and you must have seen them?” ‒ ‒ ‒ But how do you know that this is so? Suppose I said “Exerting a pressure on your eye-ball produces a red image”. Couldn't the way by which you first became acquainted with red have been this? And why shouldn't it have been just imagining a red patch? (The difficulty which you will feel
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here will have to be discussed at a later occasion).