[gugagore]

> There absolutely are children who are "blue" or "red". There aren't a lot, but they are there. [...] The analogy isn't perfect

It is perfect. Color, as you're using it, is a phenomenon of human perception. Different people have different color categories altogether [1]. Think of it this way, there is no spectrum of EM energy that is red or blue. But you can get a bunch of people to agree on naming some spectra "red" or "blue" based on how they appear. How do you do that? You teach people those categories. That's culture. We uphold these color categories with TV shows, toys, etc. I think there's a lot of use in categories like "red" or "blue". I find relatively less benefit in categories like "genius".

Let's see, you (paraphrasing) say "it's nonsense not to sort students" and also say "most students are purple, so how do we sort them?". It's my turn to be blunt: I see no coherence in what you're saying.

[1] https://en.wikipedia.org/wiki/Ao_(color)