This third instalment of the Conversation series from the Norman Foster Foundation features an interview conducted in 2019 by Hans Ulrich Obrist with the British architect on the topic of his unrealised projects. Beginning with the early years of Foster’s career, the conversation traces the various reasons why some projects remain unbuilt – from politics and finances to misleading competition guidelines. It becomes clear that while a project may never come to fruition, elements from its design can later be incorporated into realised projects, perhaps even decades later. The book includes a small selection of drawings from Foster’s archive that illustrate some of the projects discussed.