Non productive residential buildings and public buildings are made up of a number of indoor spaces of different sizes. The formation of their space requires various entities to be combined, and these entities are called building structures and accessories. The general civil building consists of foundations, walls or columns, floors, staircases, roofs, doors and windows and other accessories, such as residential buildings, office buildings, kindergartens, schools, canteens, movie theaters, hospitals, hotels, exhibition galleries, shops and stadiums.