Joanna Kulig’s performance in “Cold War” is so astonishingly captivating that it feels like a classic performance delivered by an immortal screen goddess from the golden age of film. In this half hour she talks about how her music training came in handy while shooting the intricate moving camera shots in the film, and she ponders what it means when someone says she’s “so natural.” Plus she reveals how director Pawel Pawlikowski helped her often simply by saying the words “Lauren Bacall.”