The article is a summary of research on the political, social and biological pro-cesses that influenced the modernist form of the Stadium. E. Szyc in Poznań. The stadium was built as a result of a political decision that ignored natural conditions, time and economic factors. Nature has regained the place abandoned by people - the former stadium has become a complex ecosystem of plants and animals, fought over by non-governmental organizations and urban activists, and which politicians have begun to demand, preferring entertainment over ecological development. The question arises whether as city dwellers we currently need entertainment or rather contact with evolving flora and fauna adapting to the urban environment? Are we observing a unique process of forming an urban ecosystem? The architectural de-sign, which is the result of research, assumes the protection of the stadium as a nat-ural landscape, untouched and at the same time activating the local community. The former stadium has become an integral part of the urban greenery system in Poznań and may become part of a community integrating the city's inhabitants. The article was based on research by botanists, entomologists, zoologists and architects in-volved in the protection of the stadium as a unique urban ecosystem.