A friend shared this image and asked about the shadow. As it appears the horizontals are not casting a shadow while the verticals are. It seems that the light source is on the left hand side wall, based on the vertical shadows. So how can this be?
(https://i.sstatic.net/pHYB7.jpg)
Edit - Not very clear but an image with the source of the light.
https://i.sstatic.net/WzhoT.jpg