Ключевые слова: abstract, alloy, aluminum, art, backdrop, background, banner, bar, barrier, beware, concept, construction, danger, design, frame, gray, grunge, hazard, heavy, industry, iron, ironworks, layout, line, metal, metallic, old, panel, pattern, plate, safety, screw, shape, sheet, sign, silver, steel, stick, string, stripe, symbol, template, texture, vintage, wall, warning, yellow,