There was a beautiful legend.
It has nothing to do with stone. According to the legend, thousands of years ago, when West-Hill Divine Palace was in the early years of Dazhi and Tile Mountain was still called Bun Mountain, a woodcutter called Wang Zhi accidentally entered the depths of the mountains. He saw a few old monks playing chess and went up to watch them curiously. He realized that the match was vicious, and was so enthralled that he did not leave.
An old monk realised he was drunk and gave him a bun. After Wang Zhi ate the bun, he no longer felt hungry. He sat by the chess board from dawn till dusk.
The match had still not ended even as the darkness of twilight enveloped the mountains. The old monk who had given Wang Zhi food looked up and told him, "If you do not leave now, you will never be able to."