Claustrophobic, eh. The German term Ballungsraum means more than just 'metropolitan area'. The literal translation would be 'agglomerating space'. And that's what you can see here. Cologne was preparing for the Carnival and everybody, natives and tourists, shoppers and carnivalists were on the streets.
Cologne has a population density of 2457 inhabitants per square kilometre, this doubles every weekend at peculiar places, and at special events even more people come from surrounding regions and foreign countries. It's like Bangladesh at home, you have to walk carefully, don't push! People in front of you, besides you, behind you. And you are amidst them.