Ключевые слова: architecture, assembly, backgrounds, beam, blue, building, building exterior, built structure, composition, construction, construction industry, construction site, day, design, detail, engineer, exterior, frame, galvanized, home, house, industry, iron, isolate, light and shadow, material, metal, outdoors, pattern, precast, prefabricated, project, property, purlin, real estate, residence, roof, roof beam, shadow, sky, steel, steel purlin, structure, technology, truss, truss roof,