With that approach, literally everything is in your head. Physics itself exists nowhere but in the heads of humans. Even "light itself" exists in our heads - it's just a mental construct that we use to describe certain kinds of electromagnetic energy that our bodies react in certain ways to it. "Color" is no closer of farther to the underlying reality than "light".

> literally everything is in your head.

yes it is. in some form. specifically, in model form.

most things are modeled by our heads. our culture, for the most part, teaches all of us how to do this.

so i'm saying color is a lot more like "flavor", or "texture" in a broad sense.

the funkiest difference is that in the frequency viewpoint, color is linear. however in color theory it's a wheel!