Ключевые слова: abstract, architecture, backdrop, backgrounds, black, building, close, closed, closeup, color, construction, dark, design, dirty, door, factory, heavy, illustration, indoors, industry, iron, lock, material, metal, metallic, old, outdoors, pattern, plate, rivet, rivets, rough, rusty, security, shape, sheet, steel, strength, striped, structure, technology, tool, toughness, up, wall, weathered, work, yellow,