Twentieth-century art changed as fast as its materials. From the collage experiments of Picasso and Braque in 1912, artists folded non-art matter into art: printed paper and oilcloth, then Duchamp's readymades, then Pollock's household enamel and aluminium paint, Rauschenberg's combines of tyres, stuffed animals and cardboard, Dan Flavin's fluorescent fixtures, and Pop art's commercial packaging and comic strips. Later decades brought crushed auto parts (John Chamberlain), broken crockery (Julian Schnabel's plate paintings), mud and tar (Anselm Kiefer), elephant dung (Chris Ofili) and, closing the century, Tracey Emin's own bed (1999). Traditional media never went away - oil painting and stone carving continued throughout - but the question of what a work may be made of became one of the century's main artistic motors.
Pablo Picasso , 1913, Compotier avec fruits, violon et verre ( Bowl with Fruit, Violin, and Wineglass ), Charcoal, chalk, watercolor, oil paPD-US (credit: Pablo Picasso) · source
Defining characteristics
Non-art and industrial matter visible as itself: scrap metal, plastics, neon, broken crockery, mud
Collage and photomontage breaking the painted surface with printed and found material
Assemblage and combine structures where objects project from or replace the picture plane