Ключевые слова: aging, brown, cast iron, casting, chinese characters, coverage, creative, design, detail, drainage, entrance, environmental sanitation, equipment, facilities, feature, grid, heavy, industrial, infrastructure, lid, line, manhole cover, material, materials, metal, mode, municipal, nostalgia, object, oxidation, pattern, pig iron, public utilities, repair, retro, rough, rust, shape, solid, steel, still life, symbols, texture, urban construction,