This proposal for a zero-carbon house from lightweight self-insulating concrete components combines performative aspects of this sculptural material with plastic three-dimensional form making for aesthetic and inhabitational means. Structurally, the concrete wall elements overlap and stack over each other generating a highly articulated plastically modelled elevation. Configured of three base types and an additional trio generated by flipping the wall element by 180, a wide range of facade and room differentiations are generated. These sculptural forms produce expressive internal and external pocket spaces and loggias, poches with dynamically shaped walls, open to appropriation through the user/viewer. Barkow Leibinger are an American/German architecture firm based in Berlin.