Sigmar Polke is an artist whose work defies easy definitions. He is one of the most significant painters of the post-war generation, yet his career has by no means been confined to painting. Since the early 1960s Polke has experimented with a wide range of styles and subject matter, bringing together imagery from contradictory or unexpected sources, both historical and contemporary, and using a variety of different materials and techniques. In fact Polke’s artistic diversity, and his resistance to any form of categorisation, has been seen as the only consistent theme in his work.