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 rough secure security solid standard strength strong style surface surfaced surfaces texture textured textures traditional-brick-wall variation varied various wall walled wallpaper well-built windows architecture color colour smooth curved curving rectangular rough-work off-white purple alcove angles corner dirty grime weathered builders building concrete construction-work holes hollow uneven covered covering green Rendered rendering