Seems parallel to the idea of radiometry vs photometry where photometry is concerned with a human response.
Would (For example) an alien who perceives color the same we do but with a much wider visible frequency spectrum see more colors? I've always been curious to imagine what a brand new color could look like to us.
Professor mentioned that there is no single wavelength that is purple. Though violet is close to purple in human sensation, violet is a spectral color. I found an article digging into the relation of these two colors, https://jakubmarian.com/difference-between-violet-and-purple/.
There is a great video explain why pink/violate does not "scientifically" exist: https://www.youtube.com/watch?v=S9dqJRyk0YM
It is interesting that scientist can prove that the pink cannot exist since all possible space is already "occupied" or it just cannot being find in the spectrum.
What's also cool is that human perception of color changes based on previous experience and knowledge. The idea of color constancy, where color is perceived as the same under different illumination, is pretty interesting and apparently is also present in other animals. Here's a link for more info: https://www.cell.com/current-biology/pdf/S0960-9822(07)01839-8.pdf
I found it also interesting that convolutional neural networks are somewhat similar to human vision in that: just like how human eyes can have hallucinations, neural network models can be fooled by injecting adversarial noises to the input images. To find out more, check out the link here: https://openai.com/blog/adversarial-example-research/
A peculiar thing to me is that some people are able to perceive colors at a more fine grained level than others, which helps explain why there is so much discrepancy in how different people describe the same thing
As another example of how colors really are perceptual, the language that you speak has an influence on your abilities to distinguish different colors; people whose language has more words to describe different colors tend to be able to distinguish between them, whereas people with less words in their language tend to have more trouble.