Ключевые слова: architecture, background, building, built, business, cement, city, concrete, construction, contractor, crane, development, engineer, engineering, equipment, estate, helmet, high, housing, industrial, industry, job, labor, machine, man, men at work, occupation, person, profession, professional, project, safety, scaffolding, silhouette, site, sky, skyscraper, steel, structure, sunset, teamwork, technology, tower, urban, work, worker,