Last month my flat mate moved into another city and our community had a room free. Until the new one moved in i was free to try something bigger.
With duck tape and black garbage bags i closed the window. I left a small hole with a diameter of 10mm in the middle of the window open. After switching of the light and closing the door it became really magical. At the ceiling trams and cars are moving, traffic signs at the walls. People are croosing the street at the ceiling. I was sitting inside of my own camera for more than two hours just watching the street where iam living.
Sorry, but I made the pictures with my digital camera, because you need a really high iso. But i think, for this it is ok :-)
My other flat mates declared me for totally crazy, but the results were really impressive :-)