That's a great way to discourage the skateboarders, and makes a beautiful landmark at night at the same time. Pyramids are certainly iconic and found around the world in ancient civilizations. They are still finding more and more pyramids in central America overgrown by jungle. It's amazing what humans were able to do in antiquity, they were far more clever than they are given credit for, that much is certain.

Beautiful pictures by the way, I'm glad you enjoyed Basel!