The life and afterlife of Rainer's landmark dance, with archival documentation and contemporary responses Yvonne Rainer's 1965 performance Parts of Some Sextets, for 10 people and 12 mattresses, represents a turning point in the American choreographer's oeuvre. Built on her formative years with the Judson Dance Theater, "my mattress monster," as Rainer calls it, was where she asserted her exploration of "ordinary"...