abstract architectural backdrop background barrier basic brick-wall cement color colored coloring colour coloured colouring constructed covered covering exterior external firm gray grey mortar perspective perspectives rainstreaked Rendered rendering secure security solid standard strength strong style surface surfaced surfaces texture textured textures traditional-brick-wall variation varied various wall walled wallpaper well-built appearance base building concrete concrete-pad concrete-pour concrete-work concreting construction edged edging fill filling flat flatten flattening form forming foundation foundational level leveled leveling levelled levelling mix mixed poured preparation prepared preparing rough smooth smoothing solidify spread spreading sunlight tools wet work working