The leaded and cemented stained glass of the workshop of Heinrich Stäubli (1926-2016), St. Gallen, which is integrated into churches, restaurants, and schools, continues to shape the built environment of Eastern Switzerland today. The output of the workshop is characterized by relations among stained glass, murals, and graphic, textile, and funerary arts. This is the first analysis of the artworks and the estate from the perspective of intermediality and within the framework of modern art history. The study offers a systematic contextualization of Stäubli’s work within the history of stained-glass art in German-speaking countries, elucidating not only the operations of the artistic workshop but, more broadly, the artistic-social relevance of stained glass far beyond Switzerland in the 20th century.