section_path: Materials and techniques/Stone
section_name: Stone
paragraph_text: Stone
  
  Stone sculpture is an ancient activity where pieces of rough natural stone are shaped by the controlled removal of stone. Owing to the permanence of the material, evidence can be found that even the earliest societies indulged in some form of stone work, though not all areas of the world have such abundance of good stone for carving as Egypt, Greece, India and most of Europe. Petroglyphs (also called rock engravings) are perhaps the earliest form: images created by removing part of a rock surface which remains in situ, by incising, pecking, carving, and abrading. Monumental sculpture covers large works, and architectural sculpture, which is attached to buildings. Hardstone carving is the carving for artistic purposes of semi-precious stones such as jade, agate, onyx, rock crystal, sard or carnelian, and a general term for an object made in this way. Alabaster or mineral gypsum is a soft mineral that is easy to carve for smaller works and still relatively durable. Engraved gems are small carved gems, including cameos, originally used as seal rings.
  
  The copying of an original statue in stone, which was very important for ancient Greek statues, which are nearly all known from copies, was traditionally achieved by " pointing ", along with more freehand methods. Pointing involved setting up a grid of string squares on a wooden frame surrounding the original, and then measuring the position on the grid and the distance between grid and statue of a series of individual points, and then using this information to carve into the block from which the copy is made.