It was nothing less than the dawn of a new dimension: When the theater reformer Adolphe Appia, the rhythmician Émile Jaques-Dalcroze, the architect Heinrich Tessenow, and the artist Alexander von Salzmann met in Hellerau in 1911, they created the Great Hall of the Festspielhaus, the ideal space for the theater of the 21st century. The stage constructed by Appia from flexible elements and von Salzmann's shadow-free light space opened up entirely new possibilities for expression and staging. Le Corbusier, van de Velde, and Mies van der Rohe were profoundly influenced by this. For the reconstruction of the future, the Appia stage with its original lighting concept was recreated in the Festspielhaus Hellerau for the first time in over 100 years. The project curated by Héctor Solari and the present volume explore the historical context and situate the Hellerau stage.