1994: Why the sudden appearance, in Japanese backstreets and alleys, of clusters of plastic bottles filled with water?
To ward off unwanted cats. Householders believed the cats would be frightened by their distorted reflections as they walked past. A sort of feline hall of mirrors.
Source: James M. Vardaman, Jr., and Michiko Sasaki Vardaman, Japan from A to Z: Mysteries of Everyday Life Explained (1995), pp. 19–20