Director David Lowery discusses the challenges he faced while making his film, A Ghost Story. Returning to his suburban home as a white-sheeted ghost to console his bereft wife (Rooney Mara), the recently deceased "C" (Academy Award winner Casey Affleck) finds that in his spectral state he has become unstuck in time, forced to watch passively as the woman he loves slowly slips away from him. An unforgettable meditation on legacy, loss and longing, this unique supernatural drama from the director of Ain't Them Bodies Saints was one of the highlights of this year's Sundance Film Festival. http://tiff.net