I think you&#x27;d have to think about things differently. Imagine the people with only 2 cones... Now imagine if everyone only had two cones &quot;I can&#x27;t imagine how adding an extra cone would allow you to see these different colors in trees and the sky, cause there aren&#x27;t any colors between blue and yellow&quot;. Color is a weird topic anyway because it is impossible to determine that everyone actually sees the same thing (which could explain why people have different color preferences).<p>There are wavelengths that each cone responds to.  I&#x27;m not sure that there has been any research into the matter, but I imagine that this fourth cone adds a response to a wavelength either below or above normal visible range, or maybe more likely a person with 4 cones actually has less less frequency response by the other 3 cones, and the 4th cone fills in the gap, allowing for not really more frequency response, but rather just more specific.. And then with the magic of the brain, who knows how that enhanced response ends up being interpreted<p>And finally, when she paints to recreate what she sees, I imagine that paint is much more lively to her than what we are actually seeing.. which is a weird paradoxical thought experiment in itself