Therefore, blue can sometimes serve as a reference point or anchor for those with color vision deficiencies. 2. Can you see ...
Until relatively recently in human history, "blue" didn't exist. As the delightful Radiolab episode "Colors" describes, ancient languages didn't have a word for blue - not Greek, not Chinese ...
color words are often strongly linked with emotions. Consider how English speakers frequently use colors to talk about negative affective states: feeling blue, in a black mood, seeing red.