The steps are as follows:

1. Twist the magic ruler into a horizontal line. First fix the first segment, and then rotate the second segment counterclockwise once. At this time, a rectangle and triangle will appear connected.

2. Rotate the third segment counterclockwise once, and a triangle will appear. Then rotate the fourth segment clockwise, and then rotate the fifth, sixth, and seventh segments. Repeat the rotation and one corner of the ball will be revealed.

3. Repeat the same rotation, with the eighth segment rotating counterclockwise and the ninth segment rotating clockwise.

4. Continue to rotate counterclockwise and clockwise. One more thing here: During the rotation process, always check whether the triangles and rectangles are connected. Normally, triangles and rectangles should be connected. If it is not explained, it is wrong.

5. The last two sections also repeat clockwise rotation and counterclockwise rotation.