I’m having difficulty settling on my first impressions of “ In Minor Keys, ” the main exhibition at the 61st Venice Biennale , which opens to the public on Saturday. I’m torn between a lot of different feelings. Which maybe makes sense, because the world is in escalating chaos, and the biennial itself is being torn by it from all sides. The most dramatic symbol of this state of affairs is the festival jury resigning last week over matters that seem at once politically clear (controversy over its public statement saying that Israel and Russia would not be considered for prizes) and so byzantine that no one really understands what happened. The result is that the biennale’s juried prize has been replaced by a Eurovision-style people’s choice award. A painting by Maria Magdalena Campos-Pons, paying tribute to Koyo Kouoh and Toni Morrison, at the Central Pavilion. Photo by Ben Davis. In addition, the 61st biennale opens with the burden of having lost its curator.…