Ai Weiwei, Descending Light with a Missing Circle, 2017, Sigg Collection. (MAK, Vienna, 29 January 2019. Photograph by author.) ‘I consider myself a researcher. I probably am not a collector by nature’, says Uli Sigg, former Swiss Ambassador to China who has assembled the world’s largest collection of experimental art from the Sinophone spheres. In the form of an exhibition, part of this collection travelled from the Kunstmuseum Bern and the Zentrum Paul Klee to Vienna. It is housed at the...