Dérive

thumb|A 2004 poster announcing a large-scale dérive in London, led by a psychogeography|psychogeographical society

The dérive (, "drift") is an unplanned journey through a landscape, usually urban, in which participants stop focusing on their everyday relations to their social environment. Developed by members of the Letterist International, it was first publicly theorized in Guy Debord's "Theory of the Dérive" (1956). Debord defines the dérive as "a mode of experimental behaviour linked to the conditions of urban society: a technique of rapid passage through varied ambiances."