I wish I could upvote this twice. I hadn't realized that our actual perception of color was so filtered from the physical spectrum.
I find it incredibly fascinating, from a philosophical perspective, that there are literally color combinations (i.e, greenish-red) that, despite lying within the physical spectrum to which our eyes are sensitive, we cannot see, cannot even imagine.
The thing that will really blow your mind is are there things that are red, or a group of things that have a common appearance that our minds just label "red." And what if what if the signals that reach my brain when I view "red" are shifted one to the left on the color wheel? The gradual perception of color change would be perceived but we would be looking at different colors even though we both agree that it is "Red."
> The thing that will really blow your mind is [...]
Only if "you" refers to a stoned college kid. The realization that qualia -- such as the redness of red -- are fundamentally subjective is, quite frankly, an old hat.
I find it incredibly fascinating, from a philosophical perspective, that there are literally color combinations (i.e, greenish-red) that, despite lying within the physical spectrum to which our eyes are sensitive, we cannot see, cannot even imagine.