Introduction to the Dongpo Inkstone Washing Pool: The Dongpo Inkstone Washing Pool is 1 meter long, 0.5 meters wide and 0.5 meters deep. It is made of bluestone and was the place where Su Dongpo washed his pen in his later years. The current Dongpo Inkstone Washing Pool was moved from the old Tenghua Pavilion by Su Dongpo in order to please the emperor.