ISABEL KUHL is an art historian living in Cologne, Germany. Her previous books include Andy Warhol and Vincent van Gogh (both by Prestel). KRISTINA LOWIS is an art historian at the Staatliche Museen in Berlin. SABINE THIEL-SILING is an art historian and editor whose titles include Icons of Architecture: The 20th Century (Prestel). She lives in Brisbane, Australia.