Hmong have rice sieve nets and hung in the door, that the eyes of more than a symbol of rice sieve, can see through ghost whereabouts, net Buffy is a tool, he saw a ghost will stay away.
Miao people in the door hanging rice sieve and fish net, think rice sieve symbolizes the eyes, can see the whereabouts of ghosts, fish nets are the tool to catch ghosts, ghosts will avoid away.
Miao people hang rice screen and fishnet on the door. They think rice screen symbolizes more eyes and can see through the whereabouts of ghosts. Fishnet is a tool for catching ghosts. When ghosts see it, they will avoid it.