In the reconstruction of Berlin, Sony Center stands for a new technical vision and order. It is not a building, but a part of the city. External is the “real” city; internal is the “virtual” city. The Passages and Gates reinforce this transition from the real to the virtual world.Surrounding Sony Center are the traditional urban streets and spaces. Inside is a new type of covered, urban Forum for a changing cultural and social interaction of our time. The spatial dynamics and variety is contrasted by a minimal and technological attitude. Light, both natural and artificial, is the essence of the design. Sony Center is luminous, not illuminated. Façades and roof act as a fabric, which moderates the natural and artificial light. They become a screen. With its characteristics of transparency, permeability to light, reflection and refraction, there is a constant change of images and effects during day and night, effecting not only the appearance but also maximizing the comfort and minimizing the use of resources.