Arguing against reductive reason, the German Jewish art historian, poet, and anti-fascist of the interwar period Carl Einstein wrote,  “Every structuring is a complex function.” Whether that structuring takes the form of a city or a group show, his statement (included in the press release to this exhibition) continues to ring true. Since 2009, as part of the “Curated by” initiative, Viennese galleries have invited guest curators to mount exhibitions under a given theme—last year’s was the somewhat unwieldy “Viennaline.” In response, Melanie Ohnemus