Celadon Ceramics. Some of the world’s most coveted and admired masterpieces of ceramics art were produced in Korea during the Goryeo and Joseon dynasties. Traditional Korean celadon ware has distinctive decorative elements. The most distinctive are decorated by overlaying glaze on contrasting clay bodies. With inlaid designs, known as “Sanggam” in Korean, small pieces of colored clay are inlaid in the base clay. Carved or slip-carved designs require layers of a different colored clay adhered to the base clay of the piece. The layers are then carved away to reveal the varying colors.