2. Secondly, align the short sides of A4 paper in half, then align the long sides in half, then open the folded paper to the first step, divide it into four equal parts, and then tear the middle vertically by hand.

3. Finally, open A4 paper, align the long side and fold it in half. The shredded paper is in the middle. Then, hold both ends with both hands and push the loan to the middle to complete the production of the periodic picture book.