After 20 years of theatermaking, Chicago performance collective Goat Island is breaking up. Despite Illinois offering a no-fault divorce, and the company not needing to fret about matters such as alimony or who keeps the wedding gifts, they have apparently found the disbanding difficult. For their final piece, The Lastmaker, a meditation on exits and endings, they’ve drawn on Bach’s “Art of the Fugue,” Lenny Bruce’s last routine, speeches by St. Francis of Assisi, and architecture of the Hagia Sofia in an effort to ease their separation. “Architectural dance,” “hybrid mathematics,” and “restless ghosts” further complicate the breakup. But what will they tell the kids?

Thursdays-Sundays, 7:30 p.m. Starts: Nov. 6. Continues through Nov. 16, 2008