Demand often culls his source material
from preexisting images found in the media, such as the interior of the Fukushima Daichi power plant after the 2011 tsunami, or the United States Oval Office.
Other artworks are «improvements» or modifications of
preexisting images, for example the défigurations by Asger Jorn, or collages such as those by Wangechi Mutu, realized
from medical illustrations and anatomical drawings.
Hannah Hoch, Richard Huelsenbeck, John Heartfield, and others pioneered the technique of photomontage, using
preexisting photographs, often drawn
from mass - media sources, to create composite
images that sharply critiqued German society and culture in the aftermath of World War I. Drawing on the foundations of Dada, neo-avant-garde artists of the 1950s like Robert Rauschenberg and Jasper Johns created assemblages that brought collage techniques into three dimensions — laying the groundwork for much contemporary sculpture — as well as works on paper that incorporated found elements drawn
from the mass media and everyday life.