Blue

Rare is blue when you look too close
The sky’s an illusion,
and them flying blue things
have tiny protrusions
that refract the light m
but no kind of a pigment is used it’s true that even blue is nonexistent in eye colour
Another lack of pigment actually
So blue is a sly bugger
Unless you luck out find some lapis lazuli dug up
One of only two known natural blues in existence
Everything else is just a trick