1. First find a piece of A4-sized paper (color or white paper).

2. Align the short side of A4 paper and fold it in half.

3. Align and fold again.

4. Fold the long side in half again, then open the folded one to the first step, as shown in the figure, which is divided into four parts, and then tear the middle vertically by hand.

5. Open A4 paper again, and align the long sides and fold them in half; Tear it in the middle, then hold both ends with both hands and push it hard to the middle.

6, slowly become a book that can be turned over.

Baidu encyclopedia-picture book