A black and white photograph of a tall building's staircase, behind glass. Photographed from the outside and from below. A play of straight and diagonal lines. Three stone steps running from bottom left to top right, with narrow parallel smal black lines between them from railings, on the background of the sunlit wall of the staircase. Then, diagonally from top left to bottom right, small lines from the window jambs in the glass in front of them, and two window jambs running straight from bottom to top.