The first time I saw something like this in a Swiss Restaurant in Zurich I was really confused. What should it be used for?
Then I was told that you can find those sanitary installations particularly in traditional restaurants that are frequently visited by students and they use it if they drank too much beer.
In my various travels through Europe and North America I haven't seen anything like this. So I'm really wondering if I can tell my fellow travelers that I meet if this is a Swiss/German invention? Maybe because of the lively Studentenverbindungen in Switzerland?