Ключевые слова: abstract, architecture, background, blue, building, business, center, city, concept, construction, contemporary, design, down, empty, entrance, escalator, exterior, floor, glass, hall, home, house, indoor, inside, interior, light, metal, modern, new, nobody, office, people, perspective, stair, staircase, stairs, stairway, steel, step, steps, structure, style, travel, up, urban, view, wall, way, white, window,