Ключевые слова: activity, architecture, background, blue, building, built, business, city, clipart, collage, construction, crane, design, development, digital, exterior, frame, graphic, house, illustration, industry, infrastructure, machinery, machines, outline, profession, progress, reinforcement, renovation, scaffolding, scene, silhouette, site, steel, structure, tower, urban, wallpaper, work, worker, working,