Mark Rothko. The Omen of the Eagle, 1942.
Most famous artists are fun to dig into before they were famous, but there's no one like Rothko. He had a fascinating journey, and one that when seen in retrospect was so obviously going where it was going all along.
More generally, I hope some few folks appreciate my attempts at wit in the art posts here. My choices are rarely random and I usually have a political point under the superficial points, like today. Lets look closer!