Condensed into the course of its one-minute duration, the fixed vertical of Canary Wharf functions as a physical reference marker, in William Raban’s Sundial, from 1991. Building a composite picture of complex environment, a fast cutting rate is punctuated by varying examples of diegetic sound. A night-bus passes, and a parked van is followed by the horizontal push of rush-hour traffic. A crane; docked ships and rubble heaps. The elevated, curving track of the Docklands Light Railway, and the clean vertical lines of post-war housing blocks. A view through a yellow-painted archway, and a sudden laugh. A distorted, snaking, silver reflection and a school playground. A seesaw and the multicoloured beams of circling, night-lit lasers.