The gap is a metaphorical concept with dual meanings of sociology and space. When two or more given fields do not touch or even exclude each other, the undefined left between them is called gap. In Metaxourgio and Kerameikos there are many physical or non-physical gaps, due to historical evolution, building types and population composition. The social gaps are represented by few opportunities for different groups to communicate. Greeks and immigrants living in the same Polykatoikia may not have social interaction due to the vertical segregation and different timetables. Other social gaps exist in unemployment and economic decline and lack of political public participation.
Spatial gaps exist in the rooftops between two high-rise residential units, or in many empty plots and abandoned buildings. They have potential to be transformed into shared spaces where semi-public activities occur, regeneration also the image of the urban façade. Due to the structure of Polykatoikia, another gap exists between public and private realm, which is shown by covered balconies everywhere. This phenomenon illustrates the lack of transition space. Thinking about the gaps of spatial and social significance from the urban scale, Metaxourgio and Keramikos could be considered as a gap in the city and it shows an undefined status in general.