The shape of perforation, its dimension, the different materials, the different patterns and pitches create volumes and space, transparency and opacity, light and shadow effects that can give a completely new look to a building. Last but not least perforated products offer several practical advantages such as regulating the desired amount of light into a room and, using the right open area, obtaining sound absorbing and weight reduction qualities. Perforated sunshades and sunscreens provide privacy for people living or working in a building without blocking the view. Perforated sheets help in controlling interior climate and save energy and can also be the right solution for aeration of hot or humid areas. The combination of aesthetical and technical performances makes perforated sheets an essential element of the modern architecture.