Or, Faces in the Walls.
Unlike in America, in Japan the yard or yards of a house are completely private and are typically surrounded by either a high hedge or a stone wall, or both. If there is a stone wall, often it has occasional holes for design. Vents? Places for the stray cats to run in and out, maybe.
Not always, but more often than not, these holes are placed in patterns that can look like a face when looked at.