This lecture explores the concepts of diversity, complexity, and eco-system in the context of the modern age of acceleration, focusing on how practices of commonality influence urban quality. Examples include activating common zones in various cities, enhancing urban diversity within buildings, and reintroducing commonality in urban spaces. The instructor emphasizes the importance of diverse societies coexisting in cities, using the House of One in Berlin as a model where different religions maintain their identities while actively engaging with each other.