Comment by rollulus
11 hours ago
What I missed in the article: the curves of the three “cone kinds” overlap. What if you could stimulate kinds of cones individually to see entirely new colors? Some people shoot layers at them into eyes. But you can also try this website: https://dynomight.net/colors/ (previously on HN but search fails me).
Last year a research group managed to do just that, see https://www.science.org/doi/10.1126/sciadv.adu1052 for details.
Through the magic of liner algebra it turns out that you can stimulate cones independently even with normal displays. Search for 'silent substitution'!
Also search for "impossible chimerical colors"
<https://en.wikipedia.org/wiki/Impossible_color#Chimerical_co...>
https://en.wikipedia.org/wiki/Tetrachromacy