abstract architectural backdrop background barrier brick brick-wall bricks brickwork builders building cement coloring colors colouring colours concrete constructed construction-work exterior external firm holes hollow linear lines mortar perspective perspectives rectangular rough secure security standard strength strong style surface surfaced surfaces texture textured textures uneven variation varied wall walled wallpaper corner corner-wall fixed merger merging mixed repaired smooth solid various basic color colored colour coloured covered covering green Rendered rendering traditional-brick-wall well-built angles appearance backgrounds blocks contrast contrasts cracks discoloration fitted foundation foundational growth height high large limestone moss old plants retaining retaining-wall stone stones stonework variations variety contours lichen rock rock-face rockface windows