Introduction to the Four-sided Hall: The Four-sided Hall is the largest single building in the villa, with a rolling shed resting on the top of the mountain. There is a plaque hanging in the hall with the four characters "Huanxiu Villa" written by Yu Pingbo, a master of red learning. There is a set of mahogany furniture using shells as inlay decoration, which is quite eye-catching and rare. The four-sided hall does not have too many decorations and carvings. It is very simple and elegant, following the simplicity and elegance pursued by the Ming Dynasty.