I guess part of the problem is that there are only three color receptors, rather than thousands, so there is less reason to represent commonalities between them. That said, we do talk about "warm" and "cool" colors, which mainly seems to refer to how much blue is mixes in them. So that seems a bit like a one-dimensional "heat" scale, with blue on the cold end and red/green on the work end?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.