Thank you for such a beautiful intro!
I wanted to share something I learned only recently. I took up painting as a pandemic project, and I am in the process of assembling a palette. As such, I have been researching colors and pigments, and I finally learned the difference between purple and violet. Perhaps this is obvious to some of you, but it was new information, and I thought I would share.
Violet is actually a spectral color -- meaning it is a color of the rainbow. In the English-speaking world, kids learn the acronym ROY G BIV -- where 'V' is for Violet. (The abbreviation itself is actually somewhat controversial because the 'I' is for Indigo, a color many optical scientists do not recognize, but that is a discussion for another day). To make the matters more confusing, Newton initially called the last color of the optical spectrum 'violet,' then he switched to 'violet-purple,' then to just 'purple.'
So what is purple then? Purple is a color resulting from a mixture of red and blue -- and violet. In 'real life,' we often mix them up. Depending on the culture, purple can be seen as more 'red' and violet can be seen as more 'blue.'
One more art comment -- in 1874, the alternative Salon took place by the Impressionists. The thing that shocked the world the most was the color purple -- or violet. Violet shadows in particular were mocked by everyone. Prior to that, classic artists used Sepia, Van Dyke Brown, black, and similar colors to paint shadows. The Impressionists argued that the shadows are any color by black. Monet loved purple shadows -- his argument was that violet was the opposite of yellow, the color of sunlight, so it made perfect sense to use it as a shadow color. That is quite obvious in his haystack series (I got the attached image from Sotheby's).
It is interesting that the violet shadows are what the art critics latched on to -- but at the time, that was truly shocking! In painting like that, the Impressionists literally changed the course of modern art -- these days, no one is shocked when shadows are purple or water is yellow.