The orientation of the coffin underground is: the head points to the northwest and the feet point to the southeast. When offering sacrifices, offer offerings and burn paper money. Worship is in the position of "feet" to show respect for the deceased. The coffins of Europeans and Americans are flat and their heads are slightly wider. People there don't believe in Yin and Yang, and they don't pay attention to Feng Shui. It can be seen that customs are only regional, ethnic and religious, and there is no scientific necessity.
But I don't know if you have observed China's coffin. The traditional coffins in China are all high at one end and low at the other. Why? If you look at foreign coffins, you will find that foreign coffins are all flat, only China's coffins are like this, so why are China's coffins so particular? In fact, there is a great mystery in this.
The coffin is big at one end and small at the other. In fact, it represents one yang and one yin. Yin and Yang are the basic factors behind the laws of nature and the descriptions that promote their development and changes in ancient China civilization. Yin and Yang are the objective laws of nature and the generalization of everything in the world. Therefore, putting the deceased in the coffin of yin and yang means that the deceased is between yin and yang and between heaven and earth after death.
So why should one head be high and one head be low? The coffin is equivalent to the house of the deceased. Most of the time, we call it a ghost house. Coffins are high and low, with slopes, which represent the eaves and let the rain flow down the river.
Not only is the coffin design mysterious, but even the burial is actually exquisite.