From 1983 to 2009, a grisly civil war gripped the island nation of Sri Lanka. In the aftermath, 13 artists unpacked the trauma of war as part of the group exhibition “Portraits of Intervention” at Aicon Gallery in New York. Curator Bansie Vasvani said she was drawn to the organic quality of these artists’ responses to the bloodshed, as well as the variation in form found in those reactions.