In early times, there were many functions and purposes of the Tibetan prayer stones, some of which were built as a dwelling place for the Buddhas, to ensure the peace and prosperity of the tribes and families and avert disasters; some of which were built to worship gods, to accumulate merits; some of which were geographical boundary between tribes and villages; in addition, Maini Stones at mountain passes, bridges, main roads, which are to pray for the safety of the place.
Up to now, whenever Tibetans pass by Mani Stones, they would usually add a small stone, which is equal to recite the sutras once. With the increasing of Mani Stones, the mound constantly ascends. Some of the Mani Stones form hills, and many such hills connecting together to be sacred walls. The walls are considered as the boundary between the human world and the divine world, as well as the joint and connection point.