Ignacio turned towards the sound of her voice. "But I have never seen such things. I have never seen anything at all. How can jou describe what this is for something to look red, to somepony who has never seen? Jou do not need to understand that a thing is a beet or a tomato to know that this is red, no? They have an intrinsic appearance in jour mind, does they not? That is the nature of the sense, not a catalog of the properties of the objects."