The simple answer to this question is: the Eco City is already being realized today in countless metropolises around the globe: in the form of numerous creative and innovative solutions, experiments and approaches. But in 2019, these components of a new, post-fossil lifestyle have not yet been integrally thought together anywhere in the world: however, this is exactly what is supposed to happen in the Eco City. It is to become a real laboratory for the post-fossil city of the future. The fact that our cities need to undergo an integral transformation to become post-fossil cities has not yet reached people’s minds. What is needed first is applied, integrated practice. Therefore, the Eco City in Wünsdorf is to be a holistic project that makes it possible to experience the advantages, atmosphere, sensory impressions and character of such a city of the future.