However, the eunuchs had varying influence during China's dynasties. Anderson likens this to the Chinese philosophy of yin and yang, that all forces proceed in naturally recurring cycles reaching a peak(Yang) and then dropping to the opposite depths(Yin)."The yin-yang theory seemed to be borne out in the waxing and waning of eunuch power."' The Eunuchs were at the height of their power during the Ming period (1368-1644), but some used their influence to bad effect, according to Liu, curator of the Tian Yi Eunuch Tomb Museum. The emperors of the following dynasty, the Qing Dynasty (1644—191 1) "learned from the experience of the Ming Dynasty and restricted the eunuchs. They only held positions within the palace, and weren't given positions in the government or military.”
