Some of you may have stumbled upon a giant blue head on a crane at 9th and F Streets on your coffee run this morning. That 31 foot tall, 13,000 pound sculpture is the work of Roy Lichtenstein, the renowned American pop artist who died in 1997. Known for his bright, bold colors and old-school comic book stylings, Lichtenstein already has work all over D.C.; in fact, the National Gallery of Art has the largest......