"Shoyokyo" (also called "Shoyokan") was a mirror that revealed the original shape of the subject that appeared in "Feng-Shen-Yen-I," a bizarre tale created in Ming dynasty of China.
照妖鏡（照妖鑑とも称する）は、中国明代の伝奇『封神演義』に登場する、本来の姿を映し出す鏡。