United and divided by a river, London is one of the few world cities to find its essence in two profoundly contrasting urban environments. The Italian artist Matteo Pericoli travelled the 20-mile stretch of the Thames from Hammersmith to the Millennium Dome to draw both banks of the river. His 25-foot-long folding panorama is accompanied by essays by two of the city's foremost contemporary chroniclers, North Londoner Iain Sinclair and south of the river resident Will Self.