The theme for the week is Window.

There is an odd duplication in photographing through a window, as the viewfinder constrains the breadth and scope that can be captured, and a window compresses this further.

This is taken from Southwark Bridge, there are concrete port holes at chin height all along the bridge. They pre date most of the redevelopment of London, both on the north and south banks, and so whether you see empty sky or an interesting vista is a matter of chance.