Under Krens, the foundation mounted some of its most popular exhibitions: "Africa: The Art of a Continent" in 1996; "China: 5,000 Years" in 1998, "Brazil: Body & Soul" in 2001; and "The Aztec Empire" in 2004. It has shown unusual exhibitions on occasion, for example commercial art installations of Giorgio Armani suits and motorcycles. "The New Criterion"'s Hilton Kramer condemned both "The Art of the Motorcycle" and the retrospective of the work of fashion designer Armani. Others disagreed. A 2009 retrospective of Frank Lloyd Wright at the original building in New York showcased the architect on the 50th anniversary of the opening of the building and was the museum's most popular exhibit since it began keeping such attendance records in 1992.