Ключевые слова: abstract, ancient, app, architecture, background, blank, bright, building, climb, concrete, construction, corridor, design, diagonal, down, empty, entrance, exterior, floor, gray, hall, handrail, home, house, indoor, interior, ladder, light, metal, metallic, modern, nobody, office, opening, rail, railing, stair, staircase, stairway, step, structure, style, up, urban, wall, yellow,