More than any other artist of his generation, Warhol showed us that the ubiquitous imagery of mass culture had come to reflect and shape contemporary life. Coca-Cola bottles, newspaper photographs of car crashes and of the empty desolation of the death chamber are as closely associated with Warhol as they are with America. His life's project was to explore the aesthetic and cultural associations of the term 'media', questioning structural boundaries in a way now heralded by some as 'post-medium'.