There was a Mandarin who owned a city surrounded by a wall, this wall was shaped as an orange.
There was another city, a neighboring one to the Mandarin's city. The city was surrounded by a wall shaped of a pig. This made the Mandarin mad, he felt that it would bring bad fortune.
The Mandarin didn't want the townspeople going to the neighboring city so he told his messenger to rebuild the wall into a club to drive off the pig. But the emperor,Kwan-Si, of the neighboring city did not like that. He then made a fire to burn the club.