Why is the sky blue?

I recently had it explained to me that when the white light that is emitted from the sun hits water droplets in the atmosphere, it refracts, and out of the full spectrum of light that results blue is the highest frequency of light that our eyes can see. This explanation scientifically made sense to me. It is what I learned in school, way back when. However, when I asked Noah why he thought the sky is blue, his answer impressed me much more than anything found in a text book. He told me that blue is his favorite color and that God made the sky blue just for him.

• Psalm 19:1

"The heavens declare the glory of God,
and the sky above proclaims his handiwork."