abstract architectural background barrier colors colours constructed decorative distinctive edged edges exterior external fancy fitted fitting flat gaps interconnected interlinked light linear lined lines patterns perspectives rectangular secure security shaped shapes slabs smooth stone stonework strength style surface surfaces textured textures thick thin uneven variation varied various wall wallpaper accommodation angles architecture box-like boxed building building-construction building-site building-work buildings concrete concrete-slabs concreting construction development elements gray grey home house modern modernistic plain prefabricated solid squared straight structured suburban urban views walls windows work appearance Designs details distinct mosaic rough tiled tiles