Psychogeography: a beginner’s guide. Unfold a street map of London, place a glass, rim down, anywhere on the map, and draw round its edge. Pick up the map, go out into the city, and walk the circle, keeping as close as you can to the curve. Record the experience as you go, in whatever medium you favour: film, photograph, manuscript, tape. Catch the

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Urban explorers use the dérive to map the emotive force field of the city, and the way architecture and topography combine to create its 'psychogeographical contours'. Robert Macfarlane, a masterful writer-walker of the countryside, offers this summary of the practice: 'Unfold a street map of London, place a glass, rim down, anywhere on the map,

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This third mode is inspired by another theory of walking: the dérive, a type of unplanned journey formulated by the Situationist philosophers in reaction to the overstimulation of media and spectacle