Blue Red Green Black (2004) is a four-part painting, each panel identically shaped and painted a single color. First exhibited in Kelly’s 2006 exhibition at the Serpentine Gallery in London, the painting spans nearly twenty-five feet and reflects the artist’s remarkably consistent vision. “My later paintings have all of the early paintings inside them,” Kelly explained. “An artist starts from an idea and builds on it.”

Kelly painted a number of four panel works using these colors between 2000 and 2007, including Blue Black Red Green (2000) in the collection of the Fondation Beyeler in Basel, and the monumental Berlin Panels (2000) installed in the seven-story high, glass-fronted lobby of the German Parliament.