Wittgenstein once said that the world is the totality of facts. It seems to me that at least in the case of color this theory doesn't apply. What facts can be said about the "redness" of a red object. Perhaps no facts can be said about "redness" precisely because what is being experienced in an encounter with red isn't a "fact". Do we apprehend that redness through a fact or through an experience of consciousness? It seems to me that the fact that red exists and the actuality of red are two different things since saying "red exists" doesn't say anything about what red is when it is experienced. So maybe Wittgenstein is wrong?