Outdoor areas have traditionally been punctuated with stone wall structures.
Plastered walls are either built around a frame, or attached by using steel brackets. Dry masonry structures are built by piling the stones. However, they can also be seamed. Slab stone walls are constructions made of solid stone elements, or shell structures reinforced with stainless steel brackets. The wall types are further grouped according to applied stone materials and joint types: Circular stone masonry is built by piling or masoning round natural stones. Quarry stones or loose rocks are used for a mixed masonry construction. The stones used in a cyclopean masonry construction have 3-5 edges. In ashlars the stones are standard oblong-shaped bars or slabs. In linear masonry the stone size may vary, but the longitudinal joints are continuous. The stone size and cascading both vary in rubble masonry constructions. Masonry constructions are finished and covered with cope stones. The joint surfaces of cleaved ashlars are sawed and the front edges are usually levelled. The visible parts of sawed stones usually have a flamed or bush hammer finish.