In her Invisible Sun paintings, Mehretu moves away from the focus on the city and architecture that characterized her earlier work and instead concentrates on the creative mark and invention itself. Staccato markings and paint smudges resemble graffiti, calligraphy, and even musical notation. Mehretu’s liberated, loose, monochromatic strokes flow over the edges of their canvases, recalling prehistoric cave paintings and suggesting a wide range of possible forms.