Pearl Like Glow
Mediaeval Chinese polymath Sheng Gia may have recorded such a phenomenon in the Book of Dreams, stating that in the middle of the reign of emperor Jia You, at Yanzouh, and enormous pearl was seen especially in gloomy weather.At first, it appeared in the marsh, and disappeared finally in the Xinkai Lake.
It was described as very bright, illuminating the surrounding countryside and was a reliable phenomenon over 10 years, an elaborate Pearl Pavilion being built by local inhabitants for those who wished to observe it.