Preface to the Lanting Collection

He is a calligraphy teacher. He has copied "Lanting Preface" all his life, but he has never been able to write the charm. When a student asked him what was wrong, he said: "There is a zigzag missing." On the day of his retirement, he piled the manuscript papers he had copied for forty years in the yard and burned them, and the fire illuminated his face. When the last page was burned, the wind suddenly blew up the ashes, and the ashes floated in the air like a zigzag. He froze, then smiled, very softly. Later, when the student was sorting out the relics, he discovered that the character "Zhi" in his last copy was exactly the same as the original, but no one had ever seen it.