abstract architectural backdrop background barrier basic 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 appearance conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light natural red reddish-brown rock rock-face rockface rocky rough rugged shade shadows shape shaped shapes stone strata stratum sunlight sunny sunshine veins african arid Cacti cactus clumps clusters display distinctive edge edges flora garden-plants green greenery irregular leaves ornamental patch perennials plants pointed protection ribbed ribbing ribs section sharp short-spikes small-spines spikes spines spiny succulents unusual variations variety