Now that the Chapman Brothers have been shortlisted for this year’s Turner Prize, a wider audience is sure to be examining their work. The inevitable casual examinations of their work isn’t exactly a good thing, they say. “The reason I say that is not because I intend to offend people who have a casual encounter with art because casual encounters can be very rewarding and interesting. But I’m obsessed with countering the idea that it’s necessary to those people’s lives and the necessity is brought to bear by people who have an institutional interest in art.”