The Venice Biennale previewed its 61st and most chaotic edition ever on Tuesday, just days after the unprecedented resignation of its jury over the participation of Israel and Russia undermined the very structure of the world’s oldest contemporary art exhibition. Tensions were evident as Ukrainian artists stood by a truck that had brought a statue of an origami deer from the war-ravaged eastern front to the Biennale's storied Giardini, or gardens. Just meters (yards) away, a handful of participants in the Russian Pavilion danced to house music played by an Argentine DJ. At the same time, group of Palestinians marched through the Giardini wearing the names of artists who have been killed in Gaza. More protests were expected as the preview week continued.…