abstract architectural backdrop background barrier basic brick-wall bricks brickwork cement colored coloring colors coloured colouring colours constructed exterior external 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 windows colorful colourful construction contrast cutouts decorated decorations firm gray grey rough brick builders building concrete construction-work holes hollow rectangular uneven architecture building-construction building-site building-work buildings cement-mixers construction-site development elements equipment framework home home-units homes house light materials men metal-work mixers modern pipes sand structure suburban supplies units urban walls work workers workmen dark