the finely worked jade bi disc decorated with an overall array of small raised spirals on both sides, the outer edge inscribed in the jiashen year (corresponding to 1764) with a long inscription composed by the Qianlong Emperor and inscribed to his order, finished with a seal taiyu ('supreme jade'), the stone of a pale honey-brown colour with dark brown inclusions at the rim and with small patches of encrustation; mounted within an exquisitely carved zitan table screen, the front with a central carved wood boss with the trigram qian surrounded by dragons (long) to form the well-known rebus on the Emperor's name, locking into the back panel to secure the jade, the dragons repeated on the reverse around the circular panel carved and picked out in gold in lishu with an almost identical inscription, differing only in the date being zhongchun as opposed to chunri, and followed by two different seals bide ('compare yourself to jade') and langrun ('bright and lustrous'), the frame and stand carved overall in archaistic style and supported at the sides by four dragons carved in the round