This Venetian blind is very contemporary in its design. It has tiny perforations in the blind slats that allow filtered light to enter the room even when the blind is closed, yet allowing you to see out and without letting people see in. It is not as effective as a one-way mirror but if the room is darker than the outside it will have the same effect. The only draw back with the perforations is when nightfalls the blind will allow view from outside into the room if well lit. Primarily this blind type is fantastic for daytime use, and is best combined with curtain for nighttime privacy.