Collage played a prominent and happily subversive role in the history of 20th century art; subversive because it undermined distinctions between "high" and "low" art by appropriating mass-produced images. Societal conventions were transgressed—and provocative commentary encouraged—because of the unexpected juxtapositions the collage process enabled. Beginning with Synthetic Cubism (Pablo Picasso and Georges Braque), the use of collage runs straight through Dada and Surrealism (Kurt Schwitters, Hannah Höch, Man Ray, and Max Ernst), Abstract Expressionism (Conrad Marca-Relli, Joseph Cornell, and Robert Motherwell), Conceptual and Pop Art (Ray Johnson and Richard Hamilton), and Neo-Dada (Robert Rauschenberg and Jasper Johns).