The first metal-glass facades where developed about 100 years ago and since than have undergone an incremental evolution. The basic constructional concept and its function have not changed. What has changed is the demand: On the one hand the energy performance and on the other the user comfort. The building envelope of the future will be a like a musical instrument in an orchestra, which is nicely tuned according to the ever changing surrounding conditions. It will contain a large number of technical installations.

The paper introduces Product Architecture as a method to analyze and to design constructions. On this basis students of the Facade Design Master Program at the TU Delft have developed four visionary facade designs.