Our vision - and the opportunity - is to make architectural design a driving force for the use of solar energy. Solar energy use can be an important part of the building design and the building's energy balance to a much higher extent than it is today. The development towards zero energy buildings will cause a more frequent use of building integrated solar energy systems. Due to the large size of such systems in relation to the scale of the building envelope, the architectural quality of their integration has a major impact on the final architectural quality of the building. Many solar systems do exist on the market, and with better and better energy performance. But, if they are not designed to be integrated into buildings in an appealing way, probably no building permit will be given, at least not in urban areas. And then – what is the use of a highly efficient collector if it will not be used?