Four people, carrying luggage and parcels, walk away from the viewer. With their backs to us, the figures are anonymous; they might be travellers visiting the city, or nomads moving through it. A subtle palette of cool greys and blues unites the whole, from the clothes and baggage to the surprising forms of a suddenly stormy sky. As the road stretches into the far distance, the picture evokes a mood of pilgrimage, both physical and emotional, or perhaps of exile. Overpass continues the thread of 'street pictures' Wall initiated 25 years earlier, but in a more muted key.