Small jade brush rests worked in the form of naturally occuring, evocatively shaped limestone rocks, were popular scholars' objects. See a similar but pierced Ming dynasty example sold in these rooms, 7th April 2014, lot 3688. For a Qianlong reign-marked pale green jade brush rest preserved in the Palace Museum, Beijing, see Chuimei Ho and Bennet Bronson, Splendors of China's Forbidden City. The Glorious Reign of Emperor Qianlong, London and New York, 2004, p. 90, pl. 98.