2. Fold the two opposite corners of the triangle in half along the center line and align the two corners.
3. Open the corner, open the upper corner and fold down along the center.
4. Fold the other corner in the same way.
5. Turn the paper edge upwards, and then fold the left and right corners upwards to align them with the center.
6. Open the left and right corners of the picture above, and then fold the corners inward along the broken line to make them flat.
7. Fold the two corners on the other side in the above way to make them flat.
8. Fold down the outermost corner and flatten it, then fold in the inner corner.
9. Fold the remaining three corners outward and the inner corners inward.
10. Fold the lower corner upward, and the upper corner should be aligned with the upper corner.
1 1. Fold the left and right sides along the center. After the two sides are aligned, fold the middle corner outward, and then fold the two sides tightly.
12, unfold the folded edge. When unfolding, the bottom should be pressed tightly, not loosened.
13. After unfolding, all eight corners of the inner layer should be folded in. After folding, the eight corners should be folded equally.