With this system, for example, terraces can be roofed flexibly. The roof is even waterproof in the closed state. The individual lamellae can be opened and closed at will. Likewise, in a flexible way, it can be assembled and dismantled if it is no longer needed. The installation of slats with solar collectors is also possible. The lamellae are attached with igubal® flange bearings, which are particularly suitable for the oscillating movements found here.