1. Find a square colored paper and fold it in half. Expand, align the four corners with the midpoint, fold and turn over.

2. Repeat twice to open the fold. Fold it down into a cross. Fold the four sides into traces, and the three-dimensional shape is enough.

3. Take paper and wrap the three-dimensional shape. Plug in two schoolbag straps and the simple mini schoolbag will be folded.

The combination of origami and natural science has not only become a teaching aid for architecture schools, but also developed origami geometry as a branch of modern geometry. Origami is both a toy and a thinking activity. It is a symbolic means of peace and commemoration, and also a way of recreation.