The common kitchen sieve served as the inspiration for the innovative method of constructing grid shells – by fashioning the mesh into a rhomboid shape, a net with quadrangular mesh can be formed so as to adapt to any surface gemetry. When combined with a diagonal cable net, the net becomes an ideal membrane shell, and when covered with glass panes becomes a light and transparent roof. This is an alternative to a triangular mesh surface structure. In both cases the load-bearing and glass layers are merged with one another, as the glass planes lie directly on the net´s slats, making the usual secondary structure unnecessary.