The fourth wall is missing is about human togetherness. It advocates a new local collectivity. After the Berlin Wall fell, the peripheral borders of East and West disappeared. In the face of the "reunion" process in the 1990s, a social and urban restructuring process took place, raising questions on a sense of belonging. My research on urban developments in Berlin over the last decades are juxtaposed to a plot of land on Zeeburgereiland, a newly developed urban area on the east side of Amsterdam.