“Over the past hundred years or so a very particular revolutionary sensibility has influenced the value system used in making and appreciating visual art. It feels to me that the art world today has its own visual dialect, a kind of educated mischievous slang that is learnt from making, looking at and talking about art for a long time and a love of being challenged or surprised. From outside, the art world must seem like a self-regarding mafia, but it relishes an assault on its values.”