abstract architectural backdrop background barrier brick brick-wall bricks brickwork cement coloring colors colouring colours constructed exterior external firm linear lines mortar perspective perspectives rectangular 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 alcove angles corner dirty grime weathered blocks brown craftsmanship decorative designed distinctive edges fitted interconnected interlinked mosaic patterned shaped shapes slabs stone stones stonework thick thin uneven variations variety