Raumprobe Athens is proposed as a research installation that focuses on the possibilities of architecture to produce 1:1 scale models; spaces that even if they are proposed in the correct size are still models; they are not organized as final productions but as test environments at a city scale or as not sufficient places; the produced mockups are programmatically built in order to control and preview easily non-existing environments. Temporary constructions will create public interventions such as pedestrian streets, bicycle lanes or temporary parking lots, as well as changes in the use of public and private urban spaces. Every mockup constructs thoroughly in precise dimensions the exact version of a different possible fake but possible and visible character of the city. The “provisory final” impression of mockups is here used in order that quick impressions are formed at an urban scale.