Perforated louvered façade on Ceuta library 
The Ceuta Public Library is a compact volume built with concrete. It is wrapped in microperforated metal slats, covering both openings and opaque walls. As we explained in “Micro perforated sheets and slats ” the drillings have to be conveniently studied. This case is a good solution because the percentage of perforation is low, to prevent the entrance of direct sunrays, but high enough to allow visibility of the outside.