Postmodern architecture is a style or movement which emerged in the late 1950s as a reaction against the austerity, formality, and lack of variety of modern architecture, particularly in the international style advocated by Philip Johnson and Henry-Russell Hitchcock. The movement was introduced by the architect and urban planner Denise Scott Brown and architectural theorist Robert Venturi in their 1972 book Learning from Las Vegas. The style flourished from the 1980s through the 1990s, particularly in the work of Scott Brown & Venturi, Philip Johnson, Charles Moore and Michael Graves. In the late 1990s, it divided into a multitude of new tendencies, including high-tech architecture, neo-futurism, new classical architecture, and deconstructivism. However, some buildings built after this period are still considered postmodern.
Postmodern architecture emerged in the late 1950s as a reaction against the perceived shortcomings of modern architecture, particularly its rigid doctrines, its uniformity, its lack of ornament, and its habit of ignoring the history and culture of the cities where it appeared. In 1966, Venturi formalized the movement in his book, Complexity and Contradiction in Architecture. Venturi summarized the kind of architecture he wanted to see replace modernism:
I speak of a complex and contradictory architecture based on the richness and ambiguity of modern experience, including that experience which is inherent in art. ... I welcome the problems and exploit the uncertainties. ... I like elements which are hybrid rather than "pure", compromising rather than "clean" ... accommodating rather than excluding. ... I am for messy vitality over obvious unity. ... I prefer "both-and" to "either-or", black and white, and sometimes gray, to black or white. ... An architecture of complexity and contradiction must embody the difficult unity of inclusion rather than the easy unity of exclusion.