I’m surprised the section towards them end about alternating high contrast colors producing impossible colors doesn’t link to “fechner colors” [0]. I am red-green colorblind, but when I was young I would stare at my dark ceiling fan spinning over the white ceiling and see very vivid greens and purples swimming across the blades. [0]: https://en.m.wikipedia.org/wiki/Fechner_color
Wow, I often as a child (still now) would see vivid purple and greens when I closed my eyes or in a dark room. I never thought about it but I wonder what the cause is.