This is great David, thanks for sharing. In fact, I think it deserves its own post. Also, wasoxygen mentioned in a comment on this thread that some women can perceive more colors than men. Is this a result of some women having either more cone cells? Again, thanks for sharing and don't be a stranger.The reason why primary colours come in sets of three is that human eyes have three types of light-detecting cells, called cone cells, used in seeing colour. L cones respond to all wavelengths, but respond most to those we see as yellow. M cones also respond to all wavelengths, but respond most to those we see as green. S cones respond most to wavelengths we see as blue and violet.
-This is something I likely learned about years ago but had forgotten. It's fascinating to think that our visual perception of our entire human experience is predicated by our cone cells. Do you know, are there animals with more cone cells that respond to different wavelengths than we do?