This edition of ‘C3’ centres on two themes: “Genealogical Reasoning” and “Constraints to Blessings”. In the former, the relationship between various generations of architects is explored, especially ways in which architecture can evolve without breaking with the past. Accompanied by an essay by Aldo Vanini, examples include the Heidelberg Castle Visitor Centre by Max Dudler and the Chestnut Tree Twin Houses by Lussi+Halter Partner AG. A text by Silvio Carta introduces the second theme, which espouses the hidden benefits of building within restrictions. Featured projects include the Periscope House by C+ Arquitectos and the Volcano Centre at Capelinhos.