Introduction to the Mani Dui: In front of the temple at the entrance of the Holy Mountain, there is a pile of Mani Dui built by people. The Mani stones in the Mani Dui are also covered with scriptures engraved on them. When traveling in Tibet, Mani piles can be seen everywhere, and many Mani piles have this kind of cow skull engraved with the six-character mantra. In the traditional customs of the Tibetan people, horns and skulls are important sacrifices to Buddha and gods. Wherever there are Mani piles or prayer flags, horns and skulls are usually seen.