During the graduation studio 'Antwerpen de getekende stad' the city was observed and analyzed by the graduation studio. During the analysis of the city a specific building type stood out of the morphological tissue. It was a building type which was covered by the ordinary fabric visible from the streets. It was a building type which hid itself within the core of the building blocks of Antwerp. It was a building type which strives for space-efficiency within the existing boundary of the city. Those buildings were built on those invisible parcels in order to be close to the city center and took their representation for granted. I named the process of building within the existing building blocks in Dutch 'inbreiden', the English equivalent of introverted expansion. Some of the case studies made for the studio are here on display.