Hard to understand why refraction & reflection don't have more equal roles in our largely optical conception of the mental, maybe because mirrors have been commonplace so much longer than lenses. Stranger as they're really the same thing. Diffraction doesn't seem to enter in much at all, for whatever reason.
Should reread what Goethe has to say about color, maybe this evening.
Sitting quietly with Peretz, inside both of us, mad torrents.