it isn't that they don't see it but they don't distinguish it. There is the tired cliche of someone going to a paint store and looking at 20 shades of "white" t

it isn't that they don't see it but they don't distinguish it. There is the tired cliche of someone going to a paint store and looking at 20 shades of "white" that all have different names and saying "they all look white to me." Of course the person can tell they are different shades of white but they don't break them down into different names.