Permanent art is often called “building-related”, “property-related” or “fully integrated” art. This is because the artwork forms part of a building or property. This applies regardless of whether the artwork is a sculpture on a platform or integrated into its environment to the extent that it cannot be removed without changing both the artwork and the site. Permanent art is often created specifically for its site. This makes it unique and perhaps different from how we have become accustomed to view art in the latter part of the 20th century. For example, a public artwork can be the paved surface on a public square, a sculpture that winds its way through several stories of a building, a film or a sound piece that is not visible. In brief: Public art may appear in any of the forms and expressions available in historical and contemporary art.