The Light In The Stairway

I was coming down the stairs and spotted the blue light on the balustrade, and the blue light from the window on the gray wall to the right in the photo. It was the contrast of colors that grabbed me, as well as the shadow of the balustrade on the wall to the left. When I grabbed my camera to shoot this, and looked in the viewfinder, the scene seemed a bit dizzying. So my sense is that this is about both strong design, and color contrasts. Unlike some subjects, there was no question in how I would crop this image - there seemed to be just one way to frame the scene.