We all live with boundaries, but few of us feel that as keenly as Jenny Erpenbeck, who grew up in the Pankow district of East Berlin, a stone’s throw from the Wall. Now a leading novelist of a unified Germany, she explained several years ago that when the Wall came down in 1989 and the East German state collapsed (she was 22 at the time), a ‘border’ was created between two halves of her life.