Painters know that nothing is as it first appears. Mountains really are purple in their majesty.
The color of the sky has the power to thrill me on a darkened afternoon when storm clouds have all but obliterated the sun. The picture above is not a black sky. Look again. See the pinks and even a hint of green just to the right of center? And surely you see the crack of silver as a lightening bolt splits a small space behind the tree.
Yes, sometimes the sky really is blue, but look again - are you sure?