Glass as a building material has played an important role in the history of architecture. But it has become popular in the construction of hones only in recent years because of its high cost. Last century architects recognised the capability of glass to climatically close openings while at the same time preserving the appearance of openness. Because of this property, it is possible to construct buildings solely of glass. This glass functionally seperates indoors from outdoors, thereby providing the possibility to establish certain climatic conditions indoors. On the other hand the transparency of the material allows the sensation of openness.