Ai Weiwei has done enough

This winter, Ai Weiwei returned to Beijing after a decade in exile. He found himself airbrushed from public memory. An international icon everywhere else. At home, a ghost.   The artist joined Michael Prodger soon after that trip to discuss the cost of personal freedom, in both China and in the West.   The Exchange is a new series from the New Statesman. Look out for new interviews every Wednesday.