Why were artists in the United States during the 1920s so fascinated by urban landscapes? Youth and Beauty: Art of the American Twenties, on view now through September 16, has an entire gallery dedicated to the ways its featured artists engaged with urban life. Planes, trains, skyscrapers, and factories provided subject matter, interestingly portrayed in ways that sought beauty and individuality from things that were at times considered visually unremarkable or anonymous.