During the Jiayou period of the Northern Song Dynasty, a huge "pearl" appeared in Yangzhou, which can often be seen at night. At first, it entered and exited in Beize, Tianchang County, then turned into Taishe Lake, and then appeared in Xinkai Lake, which was often seen by local residents and pedestrians from south to north.
A friend's study in Shen Kuo was built by the lake. One night, he suddenly saw this huge "pearl", which was still very close to him. At first, the room of "Pearl" was slightly opened, and the light came out from the edge of the kiss like a golden thread. Suddenly, the "Pearl" room opened wide, half the size of a seat, white as silver, and there was a jewel as big as a fist inside. Trees more than ten miles away from Fiona Fang can see shadows. I saw the sky burning like wildfire. Suddenly, the "Pearl" flew away like a dazzling sun and floated on the lake. The light emitted by this pearl is not like the pearl of the ancient moon, but like sunlight. Cui Boyi, a native of Gaoyou, often saw this pearl, so he wrote "Pearl Fu". In recent years, he has lost sight.