How do Wooden blinds open and close?

There are two sets of controls on a Wooden blind. To raise and lower the blind, the cord would be on the right hand side of the blind and when you pull this cord the bottom bar of the blind moves upwards, and each slat stacks on top of each other until the blind reaches the headrail where it cannot be raised any higher. To tilt the slats, there are two cords on the left hand side of the blind. Pulling one cord will make the slats close downwards and pulling the other cord will then make the slats close upwards.