circular staircase with black metal railing, inside the triumphal arch, paris, france. abstract background, a look downstairs an

staircase spiral circular swirl stairs abstract architecture background balustrade black building construction details element indoors interior light perspective railing retro shape stairsteps stairway view vintage structure downstairs hypnosis geometric curve round circle step arch triumphal inside upstairs tower stone metal old infinity climb travel ladder handrail stairwell elliptical fibonacci form paris france look infinite