Blueberries aren't blue by western standards, they're purple (white grapes are green, red grapes are purple, etc). The line between colors (e.g. purple purple-blue and blue) is an arbitrary classification, though, and different cultures (and subcutlures, and individuals) draw it different places.
Blue occurs in nature (the sky is blue thanks to raleigh scattering) and even in organics and minerals (that's often where humans get blue pigments from). They're not as common as colors like green, brown, grey, or even red.
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