artwork whose medium is the idea (or concept), usually manipulated by the tools of language and often documented by photography. Its concerns were idea-based rather than formal.

Conceptual art is typically associated with a number of American artists of the 1960s and '70s—including Sol LeWitt, Joseph Kosuth, Lawrence Weiner, Robert Barry, Mel Bochner, John Baldessari, and others—and in Europe with the English group Art & Language (composed of Terry Atkinson, Michael Baldwin, David Bainbridge, and Harold Hurrell), Richard Long (English), Jan Dibbets (Dutch), and Daniel Buren (French), among others. Never a stylistically unified movement, conceptual art was first so named in 1961 by American theorist and composer Henry Flynt and described in his essay "Concept Art" (1963). The term had international currency by 1967 when LeWitt published his influential "Sentences on Conceptual Art." By the mid-1970s conceptual art had become a widely accepted approach in Western visual art. Despite the resurgence of “traditional” image-based work in the 1980s, conceptual art has been described as the most influential movement of the late 20th century, a logical extension of the work begun by Marcel Duchamp (Duchamp, Marcel) in 1914 to break the primacy of the perceptual in art. Along with its critique of the visual, conceptual art involved a redefinition of the traditional relationship between artist and audience, empowering artists and enabling them to operate outside the gallery system.

Other fields of study played a major role in the experience of conceptual art. A variety of projects, proposals, and exhibitions were circulated in publications—including catalogues, artists' books, pamphlets, posters, postcards, and periodicals—which became the primary medium conceptual artists used to publicize ideas and distribute documentation. Photography gained added value as a means of recording an artist's performance of an event and as a way to create conceptual categories of architecture or place, as in the work of the American painter and photographer Ed Ruscha and the German photographers Bernd and Hilla Becher. Philosophers of language including Sir A.J. Ayer (Ayer, Sir A.J.), W.V.O. Quine (Quine, Willard Van Orman), and Ludwig Wittgenstein (Wittgenstein, Ludwig), as well as the field of semiotics, influenced many in the movement. The influence of conceptual art was widespread, and it continued to be seen in the 1980s in the work of artists such as photographer and image appropriator Sherrie Levine and collage artist Barbara Kruger and in the 1990s in the work of artists as disparate as the Scottish video and installation artist Douglas Gordon and the French photographer Sophie Calle.