Yin line carving. At the top of the picture is carved the moon wheel, with jade exemption and toads in it, and beside it is carved the Emperor Yan who introduced the phoenix to the immortality. Emperor Yan wore a bamboo hat, a coir raincoat and a wooden fork. According to the historical records, "The King of Fire, therefore, was called Yan Di and Lei Si, therefore, Shen Nong." Yan Di was also the god of medicine, and the lower part of the picture was carved with a god cow holding the title of Ganoderma lucidum herb.