From the Parthenon frieze and the Easter Island maoi to the Chinese Terracotta Warriors and the prehistoric Venus of Willendorf, sculpture is a medium as diverse as it is ancient. Traditionally worked in natural materials like stone, clay, and metal, sculpture encompasses both free-standing works “in-the-round” and reliefs, often serving as architectural elements. Sharing the viewer’s space more literally than any other medium, sculpture has given rise to some of the most iconic works in art history. The 20th century saw the explosion of traditional sculpture, wherein virtually any material could be used, as well as the rise of such diverse movements as sound sculpture and environmental art.