Augmented reality The second step in reducing ambiguity, once we established the DIY upgrade as the physical unit of the Serbian heterotopia, is to explore the many shapes and sizes in which it takes form. The framework in which it functions is set by the unoccupied space in-between a singular structure, such as two balconies or the limit between the roof and the imaginary allowed space, more commonly known as the mansard roof. The basic principle of operation is to extrude the perimeter of existing space, only with different and oftentimes cheap materials, and without any details. The only purpose of this space is to cater to the needs of adding another room in order to facilitate more people to ‘live’ together. The act of extruding every single space possible within the premises of an existing building augments the living reality. Yet, many of these existing spaces are unoccupied as people today tend to live in the other spaces. It is a very ironic situation that we are ignoring and at the same time being intensely influenced by the semiotics of the upgrade. While more and more people inhabit the other – extruded – spaces, the existing spaces become more of a theme park that can be rented via Airbnb or browsed through old photographs and movies.