Ключевые слова: architecture, assembly, background, blue, building, built structure, business, center, city, construction, construction site, design, downtown, engineer, engineering, exterior, frame, geometry, girder, high, house, image, industry, iron, light, line drawing, line pattern, material, metal, modern, office, pattern, reflection, roof, roof beam, shadow, sky, skyscraper, steel, structural steel, structure, structure background, support, tower, truss, unfinished, vertical, wallpaper background, working, workshop,