for architectural sculpture, which is attached to buildings, and for small-scale sculpture decorating other objects, as in much pottery, metalwork and jewellery. Relief sculpture may also decorate steles, upright slabs, usually of stone, often also containing inscriptions. Another basic distinction is between subtractive carving techniques, which remove material from an existing block or lump, for example of stone or wood, and modelling techniques which shape or build up the work from the material. Techniques such as casting, stamping and moulding use an intermediate matrix containing the design to produce the work; many of these allow the production of several copies. The term "sculpture" is often used mainly to describe large works, which are sometimes called monumental sculpture, meaning either or both of sculpture that is large, or that is attached to a building. But the term properly covers many types of small works in three dimensions using the same techniques, including coins and medals, hardstone carvings, a term for small carvings in stone that can take detailed work. The very large or "colossal" statue has had an enduring appeal since antiquity; the largest on record at is the 2018 Indian Statue of Unity. Another grand form of portrait sculpture is the equestrian statue of a rider on horse, which has become rare in recent decades. The smallest forms of life-size portrait sculpture are the "head", showing just that, or the bust, a representation of a person from the chest up. Small forms of sculpture include the figurine, normally a statue that is no more than tall, and for reliefs the plaquette, medal or coin. Modern and contemporary art have added a number of non-traditional forms of sculpture, including sound sculpture, light sculpture, environmental art, environmental sculpture, street art sculpture, kinetic sculpture (involving aspects of physical motion), land art, and site-specific art. Sculpture is an important form of public art. A collection of sculpture in a garden setting can be called a sculpture garden. There is also a view that buildings are a type of sculpture, with Constantin Brâncuși describing architecture as "inhabited sculpture". Purposes and subjects One of the most common purposes of sculpture is in some form of association with religion. Cult images are common in many cultures, though they are often not the colossal statues of deities which characterized ancient Greek art, like the Statue of Zeus at Olympia. The actual cult images in the innermost sanctuaries of