When Lin Zhi, a doctor of folklore, stepped into the Yinshan Mountains in the southwest border, she just wanted to use a voice recorder and camera to leave the last image data of the ancient Nuo opera that was about to be lost.
However, on the night when the village leader "sealed the altar", her infrared lens captured something that shouldn't exist - behind every dancer wearing a Nuo mask, there stood quietly a silhouette with only an outline.
