Yes, blue has been used as in art and in decoration since antiquity. Do you use blue to signify anything?
Oh yes. I know and Blue is an important colour in art and decoration since ancient times. Maybe because it lifts your mood.
The world is blue.. I love blue! That's nice! Blue sits on the visible light spectrum between green and violet. What things do you like that are blue? Blue ocean,cocktails, sea...Lol! That's interesting. Most blue colors contain mixtures of other colors, like azure has a little green and ultramarine has a bit of violet. What shade do you think LOL would be? Lol  is acronym for Laugh out loud..Lol! Oh, that LOL. Yes, it started on Usenet and is used pretty much everywhere in computer-related, and even in person, communication. Yes, that's true. Getting back to blue, it could also signify a mood, what do you think?
Blue has been an important colour in art and decoration since ancient times.