0_Apprentice
Hi, the sky is so pretty and blue today. Blue is my favorite color. What's yours.
1_Wizard
I really like blue as well. Especially blues that have an ultramarine shade, with lovely violet in it. 
0_Apprentice
There really are a lot of different shades of blue, that's for sure.
1_Wizard
Very true. It's kind of cool that there is something called the Rayleigh scattering that causes the sky to be blue and the dark color of the sea. It's an optical effect of sorts.
0_Apprentice
I think it was first produced by the Egyptians who figured out how to create a pigment for their decorative arts.
1_Wizard
I didn't know that, interesting. Another little fact, as my children have blue eyes, it's caused by from Tyndall scattering, which is light in the stroma of the iris.
0_Apprentice
Cool. The Egyptians held it high regard and even used it to decorate tombs of the pharoahs.
1_Wizard
I knew blue is one of three primary colors in color theory and painting used, but didn't know that about the Egyptians use. Learn something new every day!
0_Apprentice
It's a very calming peaceful color too, not sure why it is also associated with depression and feelin "blue".
1_Wizard
I don't really know either! During the Middle Ages, artists in Europe loved to use blue for the cathedral windows, so obviously it was a religious inspirational color back then.
0_Apprentice
Very pretty and interesting also.