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Psychogeography is the exploration of urban environments that emphasizes interpersonal connections to places and arbitrary routes. It was developed by members of the Letterist International and Situationist International, which were revolutionary groups influenced by Marxist and anarchist theory as well as the attitudes and methods of Dadaists and Surrealists. In 1955, Guy Debord defined psychogeography as "the study of the precise laws and specific effects of the geographical environment, consciously organized or not, on the emotions and behavior of individuals." One of the key tactics for exploring psychogeography is the loosely defined urban walking practice known as the dérive. As a practice and theory, psychogeography has influenced a broad set of cultural actors, including artists, activists and academics.
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The Situationist International (SI) was an international organization of social revolutionaries made up of avant-garde artists, intellectuals, and political theorists. It was prominent in Europe from its formation in 1957 to its dissolution in 1972. The intellectual foundations of the Situationist International were derived primarily from libertarian Marxism and the avant-garde art movements of the early 20th century, particularly Dada and Surrealism. Overall, situationist theory represented an attempt to synthesize this diverse field of theoretical disciplines into a modern and comprehensive critique of mid-20th century advanced capitalism.