Newman's late works, such as the Who's Afraid of Red, Yellow and Blue series, use vibrant, pure colors, often on very large canvases - Anna's Light (1968), named in memory of his mother who had died in 1965, is his largest work, 28 feet wide by 9 feet tall (8.5 by 2.7 meters). Newman also worked on shaped canvases late in life, with Chartres (1969), for example, being triangular, and returned to sculpture, making a small number of sleek pieces in steel. These later paintings are executed in acrylic paint rather than the oil paint of earlier pieces.