Three Dollar Quill

I believe I fixed some latent bugs and inconveniences with Impliciula, but the next thing to focus on requires a lot more thought to get right, or even tolerably wrong, so I'm going to try to shift focus a bit.

So, tetrachromatic vision. Looking over the sources I'm skimming suggests to me that I'm missing some important nuances, but I'm going to just forge ahead for now. In at least some birds, the discrimination between blue and green is weaker than the discrimination between red and yellow. This is similar to humans, and suggests to me that "blue and green" could be one of the later categories of color to be discriminated for birds, just like is the case for humans.

Thus, I imagine a progression from "light and dark" to "black, white, and other" where shades and tints are part of black and white, and blue-green is generally lumped into black, yellow to yellow-red into white, and "other" is a continuum between red and ultraviolet, with ultraviolet being "fuzzier". I want to say the yellows and oranges get broken out next, followed by separating red from ultraviolet, then finally separating blue-green from black. Next, dividing up the fuzzy area around ultraviolet into distinct colors, in the order of an intermediate red-ultraviolet, followed by yellow-ultraviolet, then blue-green-ultraviolet, then dividing up yellow-ultraviolet more finely.

This is all working off of vibes, and isn't taking some things into account, so I think I need to work out the divisions of hue space graphically, at some point.

Anyway, that's all I have focus for tonight.

Good night.