Ключевые слова: america, architecture, background, balance, blue, boom, build, building, business, chicago, city, cloud, color, construction, crane, day, development, engineering, equipment, high, hoisting, illinois, industry, infrastructure, lifting, load, low angle, machinery, object, occupation, orange, outdoors, project, real estate, site, sky, skyscraper, spring, springtime, steel, structure, tower crane, urban, usa, weight, work, yellow,