This work consists of two panels connected along their vertical edge, and with stripes painted across both of them. The title refers to the classical design of Roman forts, which had four sections. During the 1970s, many of Scully’s paintings had been based on a grid format. Towards the end of that decade, he began to keep the horizontal and vertical lines separate. As he explained, ‘the painting is really a separated grid, a grid that has been pulled apart’.