13-piece burr made from Tasmanian oak. Two maneuvers are implied by the puzzle's name. When oriented as in the photo, the sticks can be "expanded" away from the central vertical piece. To do so, the horizontal pieces move is a spiraling sequence. Once this is accomplished (see Expanded photo), the central pieces can twisted when pulled in either direction. Number of a limited edition of 30. Includes information card and original canvas storage bag.