abstract architectural backdrop background barrier basic brick-wall cement color colored coloring colour coloured colouring constructed covered covering exterior external firm green mortar perspective perspectives Rendered rendering secure security solid standard strength strong style surface surfaced surfaces texture textured textures traditional-brick-wall variation varied various wall walled wallpaper well-built angles appearance backgrounds blocks colors colours contrast contrasts cracks discoloration fitted foundation foundational growth height high large limestone linear lines moss old plants retaining retaining-wall stone stones stonework variations variety contours lichen rock rock-face rockface rough bricks brickwork smooth windows colorful colourful construction cutouts decorated decorations gray grey brick builders building concrete construction-work holes hollow rectangular uneven