If the universe is changing in that manner, so? It doesn't matter. We can only deal with the world as it presents itself currently. You're dipping a bit into

If the universe is changing in that manner, so? It doesn't matter. We can only deal with the world as it presents itself currently. You're dipping a bit into solipsism. "We can't be sure of anything external to ourselves." I love to slap people like that and then deny it until they can prove that it happened, using all of the solipsistic arguments to dismiss their claims. You'll find people are really ready to dismiss solipsism in the face of being slapped in the face. You are the only true judge of your emotions. If you think you're feeling something, you're feeling it. And yes, your emotions will color your actions. But that's irrelevant to whether or not something is blue.