• Consider the Finnish concept of a sininen hetki  ("blue moment"?) . . .

And its translatability into English, vs the following English expressions involving the color blue.

English-speakers (at least American English speakers) have been conditioned toward the following connotations of "blue" due to the popular [culture] thinking in which they live

• blue dream, blue movie, blue jokes, blue laws (Puritan heritage)
• 'cursing a blue streak', blue balls (venereal disease)
• 'blue book' (U.S. higher education exam answer booklets)
• having the blues, feeling blue, playing the Blues
• a blueblood, having blue blood (aristocratic)
• blue pills (cf. the 'boingg effect')
• blue bullets, bluebirds (vs red devils, yellowjackets, etc.) — drug capsules (cf. also blue heaven, blue angel)
• blue darter, blue blazer (baseball terms)
• blue envelope (vs pink slip) — notice of losing job . . .
• blue highways (cf. Blue Highways, by William Least Heat-Moon)
• blue eyes (pure, bright, innocent) vs. blue-eyed (naive)
• IBM blue, 'Big Blue'
• blue(s) (sailor), blue(s) (police; cf. "NYPD Blue") — other blue-colored "uniforms" . . .
• "blue" vs "red" states (liberal vs conservative)
• "Blue Monday" (plus "pink slips") [PDF]

Consider also other colors: red, white, brown, green, purple, yellow, pink, black . . . (including the different connotations of Black Monday, Black Tuesday, Black Wednesday, Black Thursday, Black Friday, Black Saturday, and Black Sunday — most of which have numerous 'identities' of their own)