The spectacular exhibit now at Denver's Museum of Contemporary Art has the novella-length title OVER A BILLION SERVED: Conceptual Photography From the People's Republic of China. The work in this knockout show, which is mostly digitally produced and deals with such hot topics as the Tiananmen Square revolt, SARS and creeping Americanization, is aesthetically, philosophically and technically distinct from contemporary American art. Julie Segraves, director of Denver's Asian Art Coordinating Council, assembled BILLION. As a close follower of the art scene in China, she was the ideal choice: It was surely her familiarity with the material that makes this MCA outing so darned mind-blowing.