Ключевые слова: abstract, aged, attention, backdrop, background, banner, barrier, black, caution, construction, danger, design, dirty, frame, grunge, hazard, hazardous, illustration, industrial, industry, line, metal, notice, old, paint, pattern, road, rough, safety, scratched, sign, stripe, striped, stripes, strips, symbol, texture, textured, urban, wall, wallpaper, warning, weathered, worn, yellow,