In this thesis my intention was to investigate methods and approaches of user participation in issues of public space production. At the same time, I was concerned as to whether the participation projects in the space production processes act as a disincentive for the architect's so authoritative role. The strategic investigation of the above issues that I followed was either research with interviews - discussions or with on-site actions in the field. The study area chosen was the "vulnerable lands" of Taurus. The area is of particular interest because on the one hand it is a palimpsest of memory and history (Long Walls, former Syngrou Prisons, Social housing) and on the other hand it maintains elements of a neighborhood even though it is quite close to the city center. On the occasion of the workshop held "Designing Coexistence with Long Walls on the Surface of the City", we set up a Participatory Planning group to initially delve deeper into the place and its inhabitants and at the same time try to rethink the public space between the apartment buildings. At the moment, we have succeeded in the first step of forming the group with the residents and sharing experiences from the public space and its memory through actions we have carried out in the past. Regarding the second step, we decided with the residents to make a community garden. As a precursor to the second step, I designed and manufactured urban furniture objects on a physical scale (lamp, bench, floor tiles, waste bin, pots) that in their form symbolically refer to the Long Walls and the former Syngrou Prisons. The purpose of the objects was for the concerns raised about the public space to take a material form. This happened through two actions that I carried out, in two different public spaces in this particular building block. The actions aimed at appropriating the public space and placing the objects per resident, either physically or in a design, in order to create versions of public space.