Rosiland Krauss explores sculpture in the form of earthworks. She thinks that more recently more and more things are being considered sculpture. As the term sculpture is now more loosely applied, old forms are looked to to legitimize the title for these works. Krauss makes the point that if modern earthworks are considered sculpture then so would be Stonehenge and Toltec ball-courts. But these are not at all sculpture, they serve a different purpose. Krauss explains how the term sculpture has been obscured. She states that the purest examples that come to her mind are by Robert Morris done in the 1960s. The outdoor exhibition (pictured below) of mirrored boxes – forms which are distinct from the setting because it is not actually part of the landscape although it blends in visually. In this sense the art falls into the category of not sculpture and not architecture. Krauss gives the title site construction to works such as Partially Buried Woodshed by Robert Smithson at Kent State University. The term marked sites can be used to identify works such as Robert Smithson’s Spiral Jetty.