Wang Baoqiang (R) and his wife Ma Rong arrive on May 17, 2013 for a screening of "Tian Zhu Ding" at Cannes

Chinese actor Wang Baoqiang (R) and his wife Ma Rong arrive on May 17, 2013 for the screening of the film “Tian Zhu Ding” (A Touch of Sin) at Cannes. Migration, one of the great issues of globalisation but one that until now has been poorly explored at the movies, has emerged as a major theme at the Cannes Film Festival.