Tools: A4 paper, glue stick, knife.

1. We prepared a piece of A4 paper, a knife and a glue stick.

2. Fold the long side of the paper in half, then fold the two sides of the opening down, and then unfold it to leave a crease.

3. Cut into 4 strips along the crease with a knife.

4. Fold the strip in half and then in half, and fold it again to form a small book; Fold the other three pieces of paper in half.

5. Then spread them all to leave creases and connect each piece of paper end to end.