The Ruhr region can be understood as a laboratory of intercultural coexistence, shaped by industrial migration, social change, and spatial density. This produces a tension between proximity and distance, between people and their spaces of interaction. Different forms of housing—from cooperative neighborhoods to anonymous high-rise buildings—shape social practices just as much as they influence opportunities for participation. While shared spaces and participatory processes create opportunities for dialogue, segregation and economic insecurity intensify existing lines of conflict. Cultural diversity holds the potential for new forms of expression. At the same time, neighborhood remains a fragile social construct that must be continuously negotiated. The Ruhr region demonstrates how strongly urban futures depend on the balance between diversity, social justice, spatial planning, and actual use, and how precarious this balance remains.