The Black Swan star’s directoral debut – based on Amos Oz’s A Tale of Love and Darkness – explores the ‘mythology’ surrounding the birth of the Jewish state. Is she ready for the inevitable backlash?Natalie Portman is lugging a giant, heavy-looking sofa across the floor, to get away from what she mutters is the “brutal” heat of the sunlight beating down on the corner of a private beach club in Cannes.