Red rocks and so does yellow and blue and all the rest of the rainbow!
This is one of it not the best of my "One man goodwill tour across America -and back- paintings. It's very powerful in person. You can feel the coolness of the shadows, they are translucent and clean with lots of contrast and interest while the bright blue sky has that big expansive energy that wide open spaces hold even if there are artifacts like mountains occupying some of it! So much depth and scale for such a small piece of paper.