As far as I know, color is interpreted differently between cultures, so you'd have to know how the people define "blue" (which you touched on), or how many of t

As far as I know, color is interpreted differently between cultures, so you'd have to know how the people define "blue" (which you touched on), or how many of them even speak a language that has a word for it. A question like this has a lot of assumptions built into it. We prefer to ignore such messy details, and assume our own experience as universal, in pursuit of what we like to call "rationality".