The "Architecture of the threshold" was the theme of a symposium held at the Swiss Federal Institute of Technology ETH Zurich. Experts from the fields of cultural science, philosophy, sociology and architectural history discussed the architectural and technical design of transition points, and the social interaction which takes place on the threshold.
The symposium was led by Assistant Professor of Architecture Theory at the ETH Zurich Laurent Stalder and art historian Dr. Philipp Ursprung, of the University of Zürich. In the Sempersaal Room at the ETH in March 2009, guests invited to hold lectures and lead the discussion included art historians Victor Stoichita and Bettina Köhler as well as media historian Bernhard Siegert and the author Andreas Bernard.
The symposium was documented by Anne Kockelkorn, research assistant at the Institute of History and Architecture Theory at the ETH Zurich.
The questions discussed at the symposium formed the subject of a three-year research cycle conducted by Laurent Stalder and his team of four. The result is now available in the "Threshold Atlas" ARCH+ No. 191/192, which has been created as a continuous glossary containing short entries and extended essays. By supporting the symposium and the resulting Threshold Atlas, Siedle is involved in promoting the debate which surrounds the issue of the threshold.