Massacre device

Santiago Sierra is famous for his incendiary performances, including: paying Chechen refugees to remain inside cardboard boxes, paying young Cubans for the privilege of tattooing their backs, dying the hair of Africans blonde to make them look European, and spraying 10 Iraqi immigrant workers with insulating foam. And yesterday, the artist managed to provoke German Jewish groups with a new installation - a makeshift gas chamber styled after a synagogue.