I am not even inside the building but a creeping sense of foreboding has already set in. As I try to find the entrance to Nikolaj Kunsthal, a gothic-style former church in Copenhagen, I hear the lamenting strings of Wagner’s Tristan und Isolde – the soundtrack to Lars von Trier’s 2011 end-of-the-world film Melancholia. Inside, I take a seat in a tent-like structure, similar to the one in the film, and watch as a planet hurtles towards Earth, Wagner still blasting away. Nearby lies a long table, covered in white linen and laid out for the celebration of a lifetime...