Tunnel of the mind?

Copenhagen has a driverless metro going out to the airport, which you can use as an alternative to the regional train which I used yesterday to get into the city. I know it's childish, but I had to sit at the front taking pictures, and now I've had a bit of fun with some of the Snapseed effects.

Back home again, but I feel I was worked hard by my hosts. A two hour lecture + Q&A yesterday, then another hour for the PhD students this morning.