One building. One day. 40 people swapping rooms. “Kinzig 9”, is the collective occupied housing project in former East Berlin. It has many different rooms: some big, some small, some bright, some dark. To be fair, the inhabitants swap apartments and they do it all in one day. Unfortunately, the logistics do not go as smoothly as planned and the madness of the rotation puts the group’s noble aspirations of harmonious community living to the test.