Introduction to the Heart Stone: There is a huge stone in the southwest under the Xitianmen. It is about 300 meters wide, round and smooth, with a huge "heart" carved in the middle. It is 5 meters high and 7 meters high. The center of the "heart" is a point. It can seat eight or nine people, and the entire character can accommodate a hundred people meditating. It is the largest stone inscription on Mount Putuo.