James S Saint wrote:The problem with defining it as what someone internally sees, is that the name "red" is externally given to the person. So when Mommy points to an apple and says "red", whatever color the child sees, is [by definition] red. How else would they know to call it "red"?
I don't know how colour blindness works but hypothetically if some subject/object altered 620–750 nm 400–484 THz to something like 495–570 nm 526–606 THz before producing the final image then it would complicate things and make it so that despite the fact that the subject is looking at red, she/he/it is actually seeing green because internal mechanisms have altered 620–750 nm 400–484 THz to 495–570 nm 526–606 THz (if that is at all a hypothetical possibility) But this still doesn't produce something like: the box is red all over and green all over at the same time . Or something like the box is red whilst it is not red at the same time. The box is always the same colour. Internal interpretations won't change this external fact. They would just produce a different sort of statement. Looking at the box, Jack sees red, Jane sees green. The box is red but not green. It appears green to Jane because she is looking at the box behind green glasses. This is not the same as "the box is red and at the same time the box is green" (two contrary statements being true) which as you say, is always impossible.