NEW YORK CITY.- The opening of the much-debated exhibition "Mirroring Evil: Nazi Imagery/Recent Art" on Sunday at the Jewish Museum, featuring Nazi and Holocaust imagery spurred protesters throughout the day but was generally marked by subdued reflection. The Jewish Museum exhibition may have drawn its loudest opposition before opening. In response to months of criticism from Holocaust survivors and others, the Jewish Museum placed a warning sign at the entrance to a gallery that includes the three works that opponents said they found most disturbing. The museum also added an exit from that gallery, allowing visitors to leave before seeing the most controversial works. They include "Lego Concentration Camp Set" and "It's the Real Thing," which is viewed on a computer screen and shows a portrait of the artist holding a can of Diet Coke, superimposed onto a photograph of the Buchenwald concentration camp. Opponents to the exhibition, which blends Nazi and Holocaust icons, photographs and imagery with commercial images and objects, say it makes a mockery of human suffering. However, several visitors said they found the exhibition powerful and provocative. The showing is scheduled to close on June 30.