Working on a scaffold in an airplane hangar before a live audience, Diego Rivera  painted The Marriage of the Artistic Expression of the North and of the South on This Continent, commonly known as Pan American Unity, his last mural in the U.S. The fresco depicts in colorful detail a past, present, and future that the artist believed were shared across North America, calling for cultural solidarity and exchange during a time of global conflict.  With scenes of the Bay Area as a backdrop, the mural celebrates the creative spirit through portraits of artists, artisans, architects, and inventors who use art and technology as tools to shape society.