This thesis is a scenario of a "parasitic" strategy, which aims to exploit the few vacant spaces left in densely populated areas. Kypseli in Athens was chosen as the study area, due to the large number of residents it concentrates and its dense building environment. Observing the area, between the narrow streets and the very tall apartment buildings, there are "cracks" appearing in some places, which are gaps left between buildings. Through the survey, it was observed that these places have been abandoned by their owners and now have the function of garbage dumps. We believe that these urban "cracks" are places that could be reactivated and accommodate functions for the benefit of residents. By placing scaffoldings and objects applied to them, it would allow these spaces to be used in a reversible way and create additional spaces that might "relieve" the area. Each scaffolding has a different use with a public character and is placed in one of these places. In this way, another network of movement and communication will be formed for those who need it. The logic of this "invasion" is based on the way parasites act, where through conflict with other organisms, they are driving the whole system to symbiosis and then co-evolution.