As Krzysztof Wodiczko well knows, Poland’s history abounds in traumatic events. One such occurred on December 16, 1922, when Eligiusz Niewiadomski, a conservative artist and critic, assassinated Gabriel Narutowicz, the first democratically elected president of Poland, in the Zachęta National Gallery of Art in Warsaw. Wodiczko considers this event a significant moment not only for the history of the gallery—a national monument and the host to this exhibition—but also for that of the nation. “The history of memorials,” Wodiczko argues, “is the history of the machines that only help bad things