Condensed rant: Humans are blind to the most common gasses on our atmosphere (N2, O2) and sometimes have difficulty perceiving its most common liquid (H2O). This is sensible, since otherwise we'd be helplessly wandering through "visible" fog to fall off cliffs or be eaten by giant carnivorous bats. Our "colors" are mostly a quirk of where we're from.

Now suppose some aliens arrived at our planet and said: "Wow, your planet is the most-boring we've ever seen, it's all just one N2-colored ball." We'd be a little offended! Clearly, the dumb aliens are looking at it wrong!

Flip that in reverse, and we have an artistic obligation to choose "good colors" for planets that maximizes their interesting features. We already did it for surface-views on Earth.

these materials are transparent to light it is not a property of the human vision system that light goes trough N2