Kamizumo

 is a Japanese pastime or performance which consists of a sumo match between puppets or other inanimate surrogates. The two terms, although homonyms in English, are written with different kanji, and refer to two different but related practices.
Originally, was practiced as a Shinto ritual, part of the shrine dedication ceremony at the Hachiman shrine in Yoshitomi. Every four years, performers use articulated wooden dolls, manipulated from below by puppeteers known as "odoriko" to enact a sumo bout at the shrine. Up to twelve puppets are used, representing the "kami" of the East and West. The outcome is prearranged; in the second round, the West triumphs thanks to the appearance of the "kami" Sumiyoshi.
More recently, has developed into a children's game, in which two paper or cardboard effigies of sumo wrestlers are placed facing each other and manipulated (either indirectly by vibration of the playing surface or with a stick) until one either falls or is moved out of the playing area.