The collective, founded in 2005, is working on redesigning the use of materials in architecture and construction. It is often said that the great task of architecture in future is no longer in new construction, but in rebuilding and continuing construction. But what exactly does that mean and what consequences would this analysis have for the architectural discipline? No one has tested it so broadly and intensively in recent years as Rotor. As the name implies, it’s about cycles, specifically material cycles. Together with a lawyer they have developed a “Vademecum for the reuse of building materials”. The guide combines a close examination of the legal framework with the practical experience that Rotor has gained over the years in the recycling of components.