abstract appearance architectural architecture background barrier basic brick brick-wall bricks brickwork building cement color colored colors colour coloured colours exterior external firm mortar perspective perspectives rough smooth solid standard strength surface surfaces texture textured textures traditional-brick-wall variation varied various wall wallpaper coloring colouring constructed fitted large light lines patchwork rock-wall rocks rugged secure security shaped shapes stone stones stonework strong style uneven variations well-built sunlight sunshine backdrop dark linear merger merging mixed surfaced