He lived in a cage, jumped from a window and spent a year roped to a friend: is Tehching Hsieh the most extreme performance artist ever? by Sinéad Gleeson

He has broken his ankles, endured 365 days in a cell and faced down the 20th century’s worst winter. Yet he says he is not a masochist. We meet the man Marina Abramovich calls ‘the maste…