abstract architectural background barrier basic brick brick-wall bricks brickwork building building-material colored coloring colors coloured colouring colours composite constructed exterior external fading firm linear lines mortar old partial partially-painted perspective rough secure security solid standard strength strong style surface surfaces symmetry texture textured textures uneven varied various wall white blue artwork blocks fitted large layered layers painting perspectives porous rock rock-wall rugged sandstone sedimentary-rock shade shadows shaped stone stonework sunlight sunshine variations wallpaper weathered weathering well-built backdrop cement dark smooth surfaced traditional-brick-wall variation walled