Sugar is a cheap, seductive pleasure. But its sweetness ＿＿（6）＿＿ a bitter history. For centuries it was a commodity ＿＿（7）＿＿ by slaves and refined into something white. Lately sugar has also become the ＿＿（8）＿＿ of choice in the campaign to fight obesity. Leave it to Kara Walker, a ＿＿（9）＿＿ American artist, to turn the crystals into a work of art. In 2013 Ms. Walker was asked by Creative Time, a New York-based non-profit organization that specializes in ＿＿（10）＿＿ art in public spaces, to create something for a cavernous disused sugar factory in Williamsburg, Brooklyn. Her installation has an extremely long name, but the work itself is subtle and powerful.