I think blue is such a beautiful color! It's one of the three primary colors!
Blue is an excellent color! What color would I have to combine it with to make purple?
Red! You can also mix blue with green to make azure and blue and violet to make ultramarine! It's a very versatile color!
Amazing! how does crayola create all these different colors when there is only 3 primary colors?
Exactly! I recently learned that the sky and deep sea only appear blue because of and optical effect called Rayleigh scattering. 
Rayleigh scattering sounds quite scientific. I don't know much about it.
It's a pretty complicated concept! Another crazy concept is the spectrum of visible light! Blue actually lies between violet and green on the spectrum.