What is a "mysterious coffin"? What is the secret? Yes!
Is it the wrong number? The porch refers to the gate. If you mean hanging coffins, my personal understanding is that coffins are usually buried underground. There are many places where hanging coffins are not buried underground, such as rock crevices in the mountains. There may be many reasons. I guess it may have something to do with feng shui and national customs. I have seen a movie about hanging coffins before ~ The following is reproduced from Baidu Encyclopedia: Hanging coffins are one of the burial styles of ancient ethnic minorities in southern China. This is a kind of cliff burial. Drill a hole in the cliff to nail a stake and put the coffin on it; Or put one end of the coffin in a cliff hole and the other end on a stake nailed to the cliff. People can see coffins under the cliff, hence the name. The word "hanging coffins" comes from Gu (5 19 ~ 58 1) between Liang and Chen, and "there are thousands of hanging coffins on the half cliff" (quoted from Taiping Magnolia, Volume 47).