Ключевые слова: abstract, architecture, background, black, building, circle, circular, construction, curve, dark, design, down, escape, fire, floor, geometric, grid, handrail, helix, high, industrial, inside, ladder, line, metal, modern, monochrome, pattern, perspective, railing, round, shape, sky, spiral, stair, staircase, stairway, steel, steel stairs, step, structure, tower, turn, twist, up, urban, walking, way, wood,