What is "mokumokuren"

In Japanese Mythology, are spirits that usually live in torn shōji (Japanese paper sliding walls), although they can also be found in tatami floor mats and in walls. The name Mokumokuren literally means "many eyes" or "continuous eyes." The Mokumokuren is considered by the Japanese to be one of the traditional inhabitants of haunted houses.

The only way to remove the spirit from the wall is to patch up the holes in it.

Mokumokuren are said to be an invention of Toriyama Sekien.