A few days after the World Trade Center attacks in 2001, the German avantgarde composer Karlheinz Stockhausen (1928−2007) held a press conference in which − taken out of context − he made the remark that they had been the greatest work of art. This caused great uproar and led to his condemnation by a general public who had not heard of him before. With some ten years distance, this lecture-performance will try to come to a less emotionally charged understanding of the ways in which these enigmatic comments may be interpreted.