Colors

[aaa]

and nobody would be able to find out.

First of all, color and brightness are two different things.
White and black aren't so much "colors" as they are levels of brightness, and since we can all actually see (blind people/things/objects excluded) things this means we can all at least see brightness levels, and can therefore all tell the difference between 'black' and 'white' (shades of gray may also be included in this assumption, as gray is nothing more than not quite black, and not quite white).

1. Brightness comparison:Yellow is a 'brighter' color than blue. Heck, yellow is usually a brighter color than most things.
2. Shading comparison: Pink is related to red, as they have similar shades (dark pinks look red, light reds look pink).
3. Mixing comparison: When you mix Blue and Yellow you get Green.

Testing people using questions based on variations of these three statements will lead you to believe that everyone 'sees the same colors'.
If my orange were your blue and your blue my orange, then my orange would be darker than my blue, which would be wrong, thus my orange should be your orange.

Serious enough for you?



Who thinks I need another cryptic statement in my signature??