[saghm]

I had a similar reaction at first, but I also realized that the point isn't to literally say "if someone asked what color this was, I would say blue or green" but "do I consider this 'more blue than green' or 'more green than blue'". With the idea of color as a spectrum rather than a discrete set of values, it's reasonable to ask whether a given shade falls closer what you'd consider one value or another. Even though I don't consider cyan to "be" blue, I do consider it closer to blue than green, in the same way that I consider magenta to be closer to red than blue. This is entirely subjective though, and at least personally I find it fun to see the variety of perceptions people have!