The exquisitely carved dragon head stone, with its head held high, faithfully and tenaciously showcases the splendor of the ancient buildings of the Shangyuan period and the high level of its architecture. In fact, it's just a drain outlet, nothing more. However, it marks history and art. It vividly tells people about the meticulousness and craftsmanship of the ancient skilled craftsmen in their construction. Even this unremarkable drainage outlet has been meticulously structured and has created a delightful humanistic landscape.