abstract architectural backdrop background barrier brick brick-wall bricks brickwork cement colored coloring colors coloured colouring colours constructed exterior external firm linear lines mortar perspective perspectives purple 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 architecture brick texture brick wall building color colorful colour colourful construction old red stripes structure structures variations vertical clean angles curved curving corner rough-work