Knowledge: "The Simpsons" gained a lot of interest and love since the start of the show. On the other hand, the blue became important color in art and decoration industry starting 1200.

Conversation:
I really love the color blue.
Nice to know that. Did you know that blue is a primary color in both painting and RGB colour model?
Along with red and yellow, yes -- but blue is the best :)
Agreed! It also lies just between the colors violet and green on the visible spectrum.
There's nothing like a clear blue sky to cheer the soul.
Yup, and also the color blue is between 450 and 495 nanometres. Ah, did you know blue has been important color in art and decoration?
Oh that is interesting to know. Do you know since when?

Response: Ah, I heard that the blue became important color in art and decoration industry starting 1200.