Modernist architecture emerged in the late 19th to early 20th century as a philosophical movement to reconcile architectural design with technological advancement. It emphasized form following function through simplicity and clarity. Postmodernist architecture arose in the late 20th century as a reaction against modernism, replacing its functional forms with diverse aesthetics through pluralism, irony, and contextual references. Notable modernist architects included Mies van der Rohe and Le Corbusier, while postmodernists included Michael Graves and Philip Johnson.