Ключевые слова: architecture, background, blue, building, business, cement, city, concrete, construction, crane, create, derrick, development, engineering, equipment, frame, heavy, high, hoist, hook, house, housing, industrial, industry, infrastructure, iron, lift, machine, metal, observatory, orange, outdoor, project, renovation, repair, residential, scaffold, site, sky, skyscraper, steel, structure, technology, tower, transportation, work, yellow,