What kind of line is beautiful? This is not a modern question. An aesthetician today may smile at it and shake his head, saying, “I don’t know.” He might not mean he cannot answer this question, but rather that it should not even be raised. How can a modern scholar confine himself to such a question? Indeed, who can give an answer if this question is not viewed as a proper question in modern academia? Nevertheless, even if a direct reply is impossible, this question may still be fruitful, capable of serving as a clue to certain significant issues. Moreover, if it is transformed in a way that limits its scope or changes its orientation, certain answers perhaps should be attempted.