Ключевые слова: abstract, air, backdrop, background, bars, city, construction, floor, grate, gratings, gray, grey, grid, grill, hard, industrial, industry, iron, lines, macro, mesh, metal, metallic, pattern, pavement, perforated, perspective, plate, platform, silver, steel, street, strong, subway, surface, technology, texture, textured, urban, ventilate, ventilation, walkway, wallpaper,