A mobile website that checks whether you're in the former East or in the former West Berlin.
Some friends and I were having a barbecue on a huge green area in Berlin and I was asking naively: hey, was this east or west Berlin? One of my friends instantly claimed to know the answer - 'West, of course!'. But we had no way to check.
That's why I created west-or-east-berlin.com. It's a mobile website that shows you whether you're in the former west or east of the Berlin wall. In order to decide that, of course, you will have to allow access to your current location in your mobile browser.