1. Cut two square cloths diagonally, and sew them together with four right angles of four right-angled triangular cloths as the center point to form a big square. Its side length is twice as long as the root number 2, which is about1.4m. It can be used on a square desktop with a side length of1.3m. ..

2. Cut one of them into four equal parts, and then connect them to the four sides of that piece. Cut one diagonal into four isosceles triangles, and then connect the big one to the other.

3. Cut one piece into a small rectangle with an average length of 4, and then wrap it around the other piece.