The Venice Biennale art exhibition, among the best-known and closely watched contemporary art shows in Europe, opened to trade visitors on Thursday. The main exhibition opens on Saturday and runs until November 24. The German Pavilion at the Venice Biennale showcases works by Israeli artist Yael Bartana and Berlin theatre director Ersan Mondtag. In addition to the contributions by Bartana and Mondtag in the Giardini, four other artists will be exhibiting on the neighbouring island of La Certosa not far from the Lido: Michael Akstaller, Nicole L’Huillier, Robert Lippok and Jan St Werner. Togeth…