text:  Hu also produced the work Ten Bamboo Studio Letter Paper ( <unk> <unk> , <unk> ) , a collection of paper samples , which made use of the <unk> stamped embossing technique to make the illustrations stand out in relief . Whilst primarily a catalogue of decorative writing papers , it also contained paintings of rocks , people , ritual vessels and other subjects . The book was bound in the " wrapped back " ( <unk> <unk> , <unk> ) style , in which the folio pages are folded , stacked , and sewn along the open edges . Originally published in 1644 , it was reissued in four volumes between 1934 and 1941 by Zheng Zhenduo and Lu Xun , and revised and republished again in 1952 . 
  