Ключевые слова: abstract, architecture, backgrounds, black, building, built, business, color, construction, design, down, elevated, emergency, escape, evacuation, exit, exterior, footpath, frame, home, house, industry, iron, ladder, metal, modern, moving, office, organization, outdoors, ownership, pattern, pedestrian, railing, rescue, safety, scene, security, services, shape, side, sign, sparse, staircase, steel, steps, structure, system, textured, up, urban, view, walkway,