Introduction to Mani Dui: Mani Dui, also known as "God Dui", is an altar made of stones and slates. It can be seen almost in the mountains, intersections, lakes and rivers all over Tibet. . Tibetans describe a firm and unchanging heart as "like a pattern carved on a stone." They believe that the traces left on the stone will last forever. There is a supernatural spirituality that brings them good luck.