Introduction to the Four-sided Hall: The Four-sided Hall is the main scene of the East Garden. It is a boat hall with a corridor, 15.65 meters wide and 9.50 meters deep. The hall is shaped like a boat, and is paved with cobblestones and tiles all around. The pattern is in the shape of water waves, giving people the artistic conception of living on water. The half-moon platform in the complex corridor is a good place to enjoy the moon in the Mid-Autumn Festival.