Ключевые слова: abstract, aged, backdrop, background, barrier, black, caution, cement, color, concrete, damaged, danger, dangerous, diagonal, dirty, grunge, grungy, hazard, illustration, industrial, industry, line, old, paint, pattern, peel, peeled, peeling, rotten, rough, safety, sign, stripe, striped, symbol, texture, urban, vintage, wall, warning, white, yellow,