What are the preconditions for aleatory occurrence of social interaction? Can unexpected public activities be catalyzed by specific spatial characteristic? The objective of the thesis is to explore the flexibility, mobility and adaptiveness in architecture and urban domain through the research of “Public Condenser” within multiplicity and complexity of political, economic and cultural conditions in Vesterbro, Copenhagen. Instead of proposing fixed programs that inform people how to behave, the public condenser allows spaces for multiple narratives by diverse users. The design proposed a urban living room for sharing and creativity that facilitates the encounter of unknown.