1. Prepare a blank sheet of paper and a pencil.

2. Draw a rectangle on the paper, and try to make its length greater than its width.

3. Starting from the long side on the left, fold the paper in half, and then fold it in half to the right, so as to get a curved rectangle.

4. Glue the two ends of the rectangle together and fix it with adhesive tape or glue.

5. Now, a mathematical Mobius band is obtained. You can draw different shapes and patterns on it, and you can find it has some strange patterns.

6. Finally, some related mathematical concepts and theorems can be marked and explained on Mobius belt to form a complete mind map.