The IABR–Project Atelier Rotterdam, Urban Metabolism, is one of the three IABR–2014– Project Ateliers. The complexity of the city is exposed and studied, and new and unexpected relationships within the city are explored, offering urgent and relevant challenges and opportunities to the Rotterdam area. The research has led to a compelling analysis of our unique urban metabolism, resulting in a collection of spatial economic perspectives, ideas, and insights that will inspire us when building on a strong and sustainable future for the Rotterdam region.