Just who is Keith Tyson, this year’s Turner Prize winner? For one thing, he’s unfazed by controversy: “The Turner is an important prize precisely because it keeps interest frothing away at the top end. And to ask ‘Is that art?’ is pointless. If you went to a Mercury Music Prize, you wouldn’t say: ‘Is a country-and-western album better than a punk album?’ You wouldn’t ask: ‘Is it music?’ You would just think: ‘It’s not my kind of music.’ What do I feel? How do I respond to it? Is it interesting? Those are the questions to ask.”