http://en.wikipedia.org/wiki/Postmodern_architecturePostmodern architecture was an international style whose first examples are generally cited as being from the 1950s, but which did not become a movement until the late 1970s<1> and continues to influence present-day architecture. Postmodernity in architecture is generally thought to be heralded by the return of "wit, ornament and reference" to architecture in response to the formalism of the International Style of modernism. As with many cultural movements, some of postmodernism's most pronounced and visible ideas can be seen in architecture. The functional and formalized shapes and spaces of the modernist movement are replaced by unapologetically diverse aesthetics: styles collide, form is adopted for its own sake, and new ways of viewing familiar styles and space abound.
One popular building style of postmodernist style architecture is the use of pent roofing in buildings, where roofs are slanted at an even angle from one wall to the other. Peaked roofing however, as seen on most traditional single-family homes, is an example of Modernist Architecture.
Transitional examples of postmodern architecture are Michael Graves' Portland Building in Portland, Oregon and Philip Johnson's Sony Building (originally AT&T Building) in New York City, which borrows elements and references from the past and reintroduces color and symbolism to architecture. A prime example of inspiration for postmodern architecture lies along the Las Vegas Strip, which was studied by Robert Venturi and Denise Scott Brown in their 1972 book Learning from Las Vegas celebrating the strip's ordinary and common architecture.
Postmodern architecture has also been described as "neo-eclectic", where reference and ornament have returned to the facade, replacing the aggressively unornamented modern styles. This eclecticism is often combined with the use of non-orthogonal angles and unusual surfaces, most famously in the State Gallery of Stuttgart (New wing of the Staatsgalerie Stuttgart) and the Piazza d'Italia by Charles Moore. The Scottish Parliament buildings in Edinburgh have also been cited as being of postmodern vogue.