Here is a painting I didn't expect to see at the Scottsdale Museum of the West. This was painted by Robert McCall (1919 - 2010) who worked as an illustrator for Life Magazine back in the1960's. He created promotional materials for many films including Stanley Kubrick's 2001 Space Odyssey. Later he worked as an artist for NASA.
This painting is called "Capriccio". Capriccio is a term used to describe a piece of music, painting or type of art that is whimsical, fancy or fantastical. This floating city certainly fits that description.