A venetian blind has horizontal slats, one above another. Venetian blinds can be made of a variety of materials but are normally made from metal or wood. The slats are suspended by cords allowing all the slats to move in unison and can be rotated through nearly 180 degrees. The slats can be rotated such that they overlap with one side facing inward and then in the opposite direction such that they overlap with the other side facing inward. This allows excellent control of the light and visibility.
There are also lift cords passing through slots in each slat. When these cords are pulled the bottom of the blind moves upward causing the lowest slats to press the underside of the next highest slat as the blind is raised until the blind is fully folded up. However good light control can be achieved just by using the rotation function. Venetian blinds can be chosen in a variety of slat widths to suit the individual circumstances.