A sort of half-mooon scuff mark that goes right round the back of the chair- so literally, she's worn out the floor. It's exactly where a hairdresser would tread for many, many hours of the day. And she took the photograph, and she showed it to me, and she said, 'This is me. You want to know about identity. It represents hard graft. Harriet interviewed a hairdresser whose salon floor had been wo..