[azepoi]

It can be cultural. Turquoise is often called bleu turquoise in french. So it's more of a blue to me.

[seszett]

Yes, and I'd like to see a breakdown of the answers per country.

I'm French and my boundary is at 167 apparently (though I have a poor screen and depending on where I look, I could say that even further towards the green side is still blue). But a regular occurrence at home is my wife (who speaks a different language, we don't live in France) talking about « the green table » while I'm trying hard to find any green table around us, until I realize she's talking about that turquoise table that I call the blue table. Also happens on the red/pink and pink/purple boundaries.

[warpech]

Agree. If the author collects the IP address of the response, maybe countries can be mapped retrospectively.