The name amphitheatre (alternatively amphitheater) refers to a level, open space surrounded by an oval area that gradually ascends. The area may be a man-made structure or a natural geographic formation, but it is suited for seating people on the sloping area for the viewing of spectator sports, games, concerts, displays, rallies, or theatrical performances. An amphitheatre can be classified as either an ancient amphitheatre, a contemporary amphitheatre, or a natural amphitheatre.