The archive of Lucerne-based firm DEON Architekten contains beautiful sketches and drawings in a range of techniques such as charcoal, ink, pencil, and marker, on drawing or tracing paper and on plans. Many of these sheets are collaborative works, created in dialogue-based design within the firm, with external partners, and with clients. The diversity is vast and sometimes surprising, and they all illustrate that drawing is a brilliant tool for the development of ideas. Sketches and drawings are the main lens through which this first full monograph on DEON Architekten’s work explores 19 of their buildings and projects from the years 2000 to 2025. They range