Even before I step inside, an unsettling feeling creeps over me. Searching for the entrance to Nikolaj Kunsthal—a gothic former church in Copenhagen—I’m struck by the dramatic strains of Wagner’s Tristan und Isolde. The music, famously used in Lars von Trier’s apocalyptic 2011 film Melancholia, sets a haunting scene. Inside, I sit within a draped structure reminiscent of the film’s tent, watching a planet barrel toward Earth to the sound of Wagner’s crescendo. Nearby, a long banquet table lies