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 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 artistic artwork bridgework foliage footbridge gully levels light paint painting park public shade shadows shelter stonework structure sunlight sunshine trees two-storey two-story vegetation weathered weathering blocks fitted large layered layers porous rock rock-wall rough rugged sandstone sedimentary-rock shaped stone uneven variations adhering cracked cracking cracks curved drill-holes modern mottled rectangular split splitting dark