blue is one of the 3 primary colors
Oh wow, I didn't know that! What other colors are primary colors?
the human eye perceives blue as dominant. it is the most important of the primary colors
Actually, what is a primary color?
primary colors are colors not mixed with others, like the basics, 
So, a color like green is a primary color?
sure, but blue has been one of the most important colors since ancient times
I love blue. It's one of my favorite colors. In fact, my nails are painted blue right now.