Sometimes the architecture maximizes transparency and continuity with the external environment and therefore buildings with large glass surfaces and great transparency are built; for these large creations micro-perforated fabrics are used that allow to obtain internal blinds with the view of the outside even during the hours of greatest solar radiation and at the same time guarantee adequate thermal and light comfort. Privacy and transparency can also be customized by choosing different Open Factor (O.F.) for the same type of fabric - the most common are 1%, 3%, 5% and 10%.