Art is not like other culture because its success is not made by its audience. The public fill concert halls and cinemas every day, we read novels by the millions, and buy records by the billions. 'We the people' affect the making and quality of most of our culture, but not our art.

Gaza is often described as 'the world's largest open air prison' because no-one is allowed to enter or leave. But that seems a bit unfair to prisons - they don’t have their electricity and drinking water cut off randomly almost every day.

When you go to an art gallery you are simply a tourist looking at the trophy cabinet of a few millionaires.

A wall is a very big weapon. It's one of the nastiest things you can hit someone with.

Nothing is black and white, and there is no purity and there is no such thing has justice.

It's impossible to predict which paintings will last and which won't. In New Orleans I painted on a dilapidated shop in a street littered with abandoned cars and rotting mattresses, then two hours later the piece was gone. It turned out I'd picked the side of a crack house and the proprietor didn't like the attention.

Modern art is a disaster area. Never in the field of human history has so much been used by so many to say so little.