Low-light sight colour stuff

Eyes.

Animals see colours differently, different priorities

Assume the humans in the game are the humans that made the game
>don't have low-light vision.

Animals, though, do have "low-light vision" (sort of, shut up)
Animals also see colours differently. Sometimes less actual colours, sometimes some colours are predominant, and any variation in-between.

THEREFORE:
Non-humans see colours differently and/or have different visual priorities.

What could this mean?
Elves have more affinity for plants because green is more vivid, more real?

Some races focus on reds because that's a colour they DO pick up on, and genetic memory means it's a bad colour? (races can have fucked-up primal history, because D&D, dammit.)


Maybe hill halflings can't see yellow.
So some orcish slavers wear canary-yellow suits to hunt them.

If a race can't see a colour, then that colour blends in with other unseen colours.

Some group that destroys anything they see that is brown, or blue.

Animals with really weird, regionally specific colourations.

Wizard with racial infravision doesn't know that his Chromatic Spray is mostly ultraviolet.