Sustainability has become a guiding principle of the twenty-first century. For the architectural office Bob Gysin + Partner BGP, this is not only an ecological premise but also stimulates and drives its architectural work. They have been setting standards with this approach for forty years and count among the leaders and pioneers in the European architecture scene. The catalogue presents their modes of thought and methods and provides insight into their planning and implementation practices, which can be attributed to the uniqueness of their projects-from the Chriesbach aquatic research institute to the new headquarters of Greenpeace. It is furthermore an opportunity to address the simultaneous practice of architecture and art and their interconnectedness with sustainability. At the same time, it repeatedly succeeds in transgressing boundaries as well as connecting social involvement and cultural relevance with one another.