This shadow looks as though it has been cast by some towering cathedral with an immense spire. But it's just a quirky combination of mid-morning light and architecture. There is a pyramid-shaped piece of masonry on the building on the right of this picture. It's not even a couple of metres high, but when the sun is at a certain height, it casts the shadow of the masonry on the triangular, opaque blue glass ceiling on the left. Regular readers would recall that a few weeks ago I posted Darth Invader with a couple of photographs evoking one of the most memorable villains in movie history.