In its early years, the Seagram Building and its plaza was used for displays and exhibitions. For instance, in 1958, the building held an art show to celebrate the 13th anniversary of the founding of the United Nations. A sculptured head from the Mesoamerican Olmec civilization was displayed in the plaza in 1965. The World Monuments Fund displayed a "moai" head in the Seagram Building's plaza in 1968 to draw attention to the artifacts on Easter Island, which were seen as endangered. "Atmospheres and Environment XII", an environmental steel sculpture by Louise Nevelson, was installed at the Seagram Building's plaza in 1971. Other sculptures or artworks erected in the Seagram Building and plaza included Barnett Newman's sculpture "Broken Obelisk", displayed in 1967, as well as Jean Dubuffet's sculpture "Milord la Chimarre," displayed in 1974.