The National Saudi Library has a spectacular sunscreen made by sails forming overlapping slats. The fabric is teflon reinforced with fiberglass. Actually it should not be here because this is a fixed solution, it is not possible to change the orientation and inclination of slats.
Taking the details into account, I think that its operability would have been possible, but obviously expensive.
The effectiveness of the protection against diffuse radiation causes a very poor outward visibility. From the inner space, the outcome lighting, shadows and reflections of transparencies, are spectacular.
General view of the building:
King Fahad National Library in Riyadh (Saudi Arabia)