Ключевые слова: architecture, barn, black, bridge, building, business, commercial, construction, engineering, equipment, exterior, factory, foundation, frame, framework, framing, garage, girder, glyph, house, icon, illustration, industrial, industry, iron, job, layer, line, list, machine, material, metal, metallic, modern, monochrome, part, production, roll, roof, selfframing, sign, stage, steel, structure, symbol, technology, tool, warehouse,