Looking at the sky, always gives you strength, piece and relax mood. Whenever you look at them, you will see a new beauty; that will cool your eyes again. It means you will see always something different, the light, the cloud, the color, and many things.
I have heard some prisoner had to stay in a dark small room. They could see nothing but a small window to sky. Then jail workmen found that the person getting strength from the sky only. Well they became cruel, the close that window too. What a punishment.