“My work is sometimes like the poppy flower. It has this almost romantic side, but yet it also represents a poison,” says Cai Guo-Qiang, who harnesses the explosive power of gunpowder to create epic works that are born in violent on-site acts of performance. For his show "Inopportune" at MASS MoCA, Cai explores catastrophe, pain and the meaning of terrorism in the world since September 11th with an installation of tumbling cars that follow a path through the air. In neighboring galleries, a video imagines a car bomb in Times Square and a series of stuffed tigers pierced by arrows elicits a disturbing, visceral reaction. “Behind all this is a very earnest and frank look at our society today,” says Cai.