As early as the late Ming Dynasty when mechanical clocks was first introduced into China Imperial Palace, emperors had showed great concerns about them. At present, there are still over 1,00 pieces of practical of such clocks in the Imperial Palace which are not only expensive devices of practical use, but also exquisite artworks. Featuring exquisite workmanship and great value of appreciation and entertainment, this series of playing cards are based on the photos of the masterpieces among these clocks.
