'My art teacher Mr Davies told me I was very good at abstraction. I believed him.'

The Turner prize only really works for me when it discovers a genius. I'm using the word loosely. A genius in this context does not mean Leonardo da Vinci but it does mean an artist to get excited about, whose work is surprising, satisfying and complex, and defies the pessimism that tends to weigh me down when I think about current British art. This year, Turner prize nominee Rebecca Warren doesn't defy my pessimism - she has cured it.