Several exchange shelves are located throughout the campus, where you can help yourself. The principle is simple: If you like a game or book on the exchange shelf, simply take it with you and replace it with something similar that you still have at home but no longer need. This way you can constantly get new reading and playing material without having to pay money for it. You can find the CampusPlus exchange shelf at the underpass between buildings 46 & 48. Further exchange shelves are located at the library (building 34), at the AStA (building 464 - 205) and in the Social Sciences Department (building 57 - 4th floor). The shelves will become more exciting week by week as you fill them with new life. Have fun!