True blue

Blue is not blue. In A's reality, blue is blue. In B's reality, blue is green. In C's reality, blue is red. Question: which blue is true? Well, it's simple. Given, that nothing is what it is. Corollary, nothing is what it seems. Inference, everything is the opposite of what you think it is. Deduction: since green has some blue in it, the answer is C.