Introduction to the "Untied Boat": The popular name of the "Untied Boat" is Zhizhou. The dry boat, also known as the stone boat, was built in the Ming Dynasty and is the best "untied boat" in Shanghai gardens. It was originally the painting and calligraphy boat of the owner of the garden, with the words "Not tied to the boat" inscribed by Zhu Yunming on its forehead.