Buried bluestone in the northwest corner of the building?

Shi Gandang, Mount Tai: When people build houses, they often set up a corner stone with bluestone in the northeast corner of the house, engraved with the words "Mount Tai Shi Gandang". According to "Lun Heng Ghost Book", "The famous ghost gate in Northeast China is haunted by ghosts". Blessed are people who break down the ghost door with stones so that all ghosts can't get in. "Mount Tai Shi Gandang" said that the Yellow Emperor fought fleas, and the Yellow Emperor was defeated on Mount Tai, and fleas chased Mount Tai, saying, "Who dares to do it in the world? "In the panic, the Yellow Emperor saw the mountains and rocks, shouted" Taishan Shi Gandang is also ",flew over the mountains and rocks, and finally defeated the fleas. Therefore, Taishan stone can cure ghosts in the world. Litaishan Stone has a certain ceremony. In silver moon's Silver Day in silver moon, tigers must attend, and there are certain sacrifices, chanting Anshi Mantra and so on.