Cosima von Bonin's art is dry. And it's not easy to decipher. This is as true as ever of the exhibition organized by the Kunstverein's new director, Yilmaz Dziewior. In itself, being cryptic is no indictment—at least according to Theodor Adorno, who called for modem art to be unintelligible. The idea was to make it harder to co-opt. But is that the case with von Bonin's art? Apparently not. The edition of mushrooms she made for the Kunstverein, in green loden or orange felt stuffed with foam, sold out immediately. In Germany, von Bonin is one of the most best-known artists of her generation,