AJ 20.03.25: Natural MaterialsThis month's issue demonstrates how building more with natural materials promotes sustainability, circularity and joyful architecture. We highlight three projects with natural materials at their core, including Hugh Strange Architects' House on a Hill; David Kohn Architects' sinuous expansion of one of the University of Oxford's oldest colleges; and a community food market in Ilford designed for disassembly by Clark Architecture and Webb Yates. For