abstract architectural backdrop background barrier basic brick brick-wall bricks brickwork cement colored coloring colors coloured colouring colours constructed exterior external firm linear lines mortar perspective perspectives secure security smooth solid standard strength strong style surface surfaced surfaces texture textured textures traditional-brick-wall variation varied various wall walled wallpaper well-built rectangular rough rough-work purple angles brown craftsmanship heritage historic local-stone old patched patchwork pattern patterns picturesque random randomly-coursed rock rocks shape shapes significant stone stone-walled stones stonework stucco traditional uneven variations variety