A searing Marlene Dumas diptych featuring portraits of Hannah Arendt and Martin Heidegger (“Hannah Arendt and Martin Heidegger,” 2017) hangs in the next room. You see just the faces (and the intense, haunted eyes) of these extraordinary thinkers whose relationship (which involved a torrid, secret affair) was about as complex as things get: brilliant pupil (Arendt) and esteemed teacher (Heidegger), German Jew and Aryan German, strident Nazi opponent and Nazi Party member.