Need to prepare a piece of paper.

1. Fold a square piece of paper in half diagonally, and then fold a trace diagonally. Fold the left corner and the right corner in half, so that both sides overlap the middle folding line. Open a corner and turn back. It should be noted that the edges should be aligned and overlapped.

2. The left corner is also folded. Fold the corners of the back and side of the paper inward to the position shown by the red line. The left corner is also folded over. Then fold it in along the red line. Fold the left side, too

3. Then fold the back of the paper, with the vertical triangle down, the triangle inside, the back of the paper and another triangle inside. Finally, it presents a trapezoid. Gently nest the empty space in the middle to present a three-dimensional; The two corners are also gently pinched into a solid, and the paper ingot is folded successfully.

Gold or silver ingots (used as money in ancient China)

Yuanbao is an ancient currency, made of precious gold or silver. Generally, there is much silver and little gold. In the currency history of China, gold and silver were officially called "gold ingots", which began in the Yuan Dynasty. But as early as the early Tang Dynasty, when Kaiyuan Bao Tong was alive, the people read it as "opening an ingot" because of its huge and precious value.

In the Yuan Dynasty, gold and silver money was called "gold ingot", which means the treasure of the Yuan Dynasty. Gold is called "gold ingot" and silver ingot is called "silver ingot", which has both political meaning and common name of gold and silver currency.