The glass floor
I took this shot while walking across Tower Bridge. I was looking up to see if I could spot the (relatively) new glass floor that has been installed. If you click on the image to enlarge it, you can see it more clearly.
(Click on image for larger version.)
I can’t decide if this photo is a by-product of my curiosity or not. Is the unusual perspective accidental or deliberate? I can’t be sure, and it doesn’t really matter to me.
(Other, similar images can be found on my Flickr site – if you’re interested.)