When Su Shi was 58 years old, he was demoted to the coastal city of Huizhou, Guangdong Province. It is said that when Su Shi was demoted to Huizhou, only one sheep was slaughtered every day in the market there for people to buy, and pork was rare there. Because Su Shi was demoted as an official, he was embarrassed to buy mutton, so in order to satisfy his craving, Su Shi bought back the sheep spine that people didn't like at that time.