A distinctive type of white porcelain, it is called the moon jar (dal-hangari) because the shape is reminiscent of the full moon. Moon jars were made by joining two clay hemispheres. The resulting seam is often visible, and the overall shape has an organic appearance. Moon jars appeared after the 17th century and were produced at the kilns in Geumsa-ri, Gwangju, Gyeonggido Province in the early 18th century.