Sixty-year-old Di Weisheng works as a researcher at the rare book division of China’s National Library in Beijing, where he restores old books and documents that are falling apart.
He uses a special glue and rice paper that are of similar colour to patch up thousands of visible or invisible holes on book pages with the help of a magnifier.
However, this is the easiest part of his job.
Many books have been soaked by flood waters for a long time and have never properly dried.
Most of their pages are stuck together.
Many more older books simply fall into fragmentary pieces once touched.