I should really have described this previously Cologne Crane. That was another in joke. I do not know exactly where it came from, I don't think I ever did - I must have been driving. But there was some confusion trying to find our way round Cologne and someone must have thought a crane was the cathedral (or vice versa). And for the rest of the trip these two words were transposed. It meant we saw a lot more cathedrals on the trip than we expected.