Building blocks

VLATKA HORVAT:  ALSO CALLED: BACKBONE, ANCHOR, LIFELINE  How does the body respond to its environment? Using materials culled from the neighborhood around the gallery, Horvat investigates, building a precarious space with paths and obstructions. Through Dec. 20. Boston University Art Gallery at the Stone Gallery, 855 Commonwealth Ave. 617-353-3329, www.bu.edu/art/ Cate McQuaid