Walking the rooftops

I find I'm always doing various takes on this theme, i.e. a person walks by in front of a bizarre background, although you may or may not have noticed because the framing is often different. Like with most of these shots, it's actually more difficult than it seems because it's always shot from a moving vehicle (shots like this tend to pop up for me only when I'm in a cab/bus/train) and the background is a small area of usually only one building block in size. This was shot in Berlin, Germany. Nikon D200, AF-S VR Nikkor 18-200mm f/3.5-5.6