Pretty nice description of how the mind sees color. (This morning I had a revelation about color: Red and Violet [oposite ends of the spectrum] seem "near" to each other, and are placed adjacent to each other on color wheels so often because they are nearly "octaves" of each other, as 700nm (red) is nearly double 400nm (violet).)
rwc.uc.edu/koehler/biophy...
