Ключевые слова: black, bright, circle, close, closing, corridor, environment, epoch, escalator, exposure, glass, handrail, highlight, indoor, light, line, metal, modern, moving stairs, people, public, rail, railing, railings, railroad, rails, railtrack, railway, reflection, shape, silver, skylight, stair, stair tread, staircase, stairs, stairway, step, steps, structure, track, tube, vehicle,