abstract architectural background barrier basic brick-wall bricks brickwork coloring colors colouring colours constructed exterior external firm fitted large light lines patchwork perspectives rock-wall rocks rough rugged secure security shaped shapes solid stone stones stonework strength strong style sunlight sunshine surface surfaces texture textures uneven variations various wall wallpaper well-built backdrop brick cement colored coloured linear mortar perspective smooth standard surfaced textured traditional-brick-wall variation varied walled rectangular rough-work purple color colour covered covering gray grey rainstreaked Rendered rendering