From your linked article: >The colored region of the plot, labeled "visible region", contains points in the space representing colors humans can see, while the

From your linked article: >The colored region of the plot, labeled "visible region", contains points in the space representing colors humans can see, while the non-colored region contains points representing physically impossible cone stimulations. Visual perception goes way way way beyond just what the eyes' cones can physically see — you've got an entire brain back there trying to interpret optical nerve phenomena! For a nice brain tickler, look up physically impossible to conically detect Chimerical Colors (e.g. stygian blue; self-luminous red; hyperbolic orange), which can be seen without actually having been seen † †: https://www.perplexity.ai/search/please-provide-chimerical-colo-fWLdF63cR3yPaiTvBoKnEw https://www.perplexity.ai/search/please-provide-chimerical-c... W: https://en.wikipedia.org/wiki/Impossible_color https://en.wikipedia.org/wiki/Impossible_color