One of the most fascinating themes of German Expressionist architecture of the teens and 1902s was the glass and crystal. While many Expressionist projects have in common the use of glass as a construction material, it was chosen not only for its transparency flexibility, but rather as mystical, romantic, and a metaphor for spiritual transformation. With its purity and clarity, the crystal represented the supreme synthesis of form and beauty. One of the more successful manifestation of this concept was the
Glass Pavilion, designed by Bruno Taut for the 1914 Werkbund exhibition in Cologne. It was a fairy-tale pagoda with a pointed dome, constructed on a concrete base with stairs and floors of glass bricks. Some of the icons inspired by this remarkable building are the Chrysler Building and the Norman Foster's Swiss Re Office building in London.