Material: square origami.

1. First, let's find a rectangular piece of paper and fold one short side in the direction of the other short side, but don't align it, leaving only one side, which is usually half of 1/3.

2. After that, we will fold the opening edge of the paper with shorter upper layer to the opposite side, but don't align with the opposite side, so that half of the paper with shorter upper layer can go out.

3. Then fold the lower paper in the same direction, and the edge is aligned with the edge of the bottom paper.

4. After that, we can see that the paper is wide and narrow. We align the corner of the wide side with the line inside.

5. Then fold the corner of the left narrow side to the inside line.

6. After that, fold the inner line of the narrow edge to the wide edge.

7. Finally, we will erect the big end of the origami, open it with our fingers, and press the two ends down to reflect the shape of the ingot, and we will fold it out soon.