BücherBaum, which means Tree of Books, is a bookcrossing.com initiative which promotes the exchange of books and bring people together through reading. The Tree of Books is a kind of artificial trunk containing small “window” in which one can find books of every kind and genre. The concept is simple: Take one, leave one. It is located in Berlin, Germany, in the heart of PrenzLauer Berg, an area characterized by its restaurants, shops and bazaars. However, this is not the only tree of books, and we can also find them in several cities in Germany and some other in Europe. With this concept one can get rid of books one no longer use but can work for someone else, and so also take home one new.