Sometimes, this design is also called Twist Basket. It takes inspiration from the Twist Basket design in stair balusters as shown below-left:
Although the baluster on the left has 4 twisted strips, the adenium plant on the right has 6 twisted strips.
The concept is easy. Create a basic cage and then carefully twist the top half of the adenium stem so the cage twists along with it. The technique for successfully twisting the cage is the main topic for this article.