Naruko, Kochi Yosakoi Museum.

“One of the defining aspects of yosakoi dance is the use of naruko: small wooden clappers that are held in the hands of each dancer. Naruko were originally used in Kōchi Prefecture to scare birds away from rice fields. The traditional naruko has black and yellow beaters on a wooden body, but most modern yosakoi groups create their own naruko, choosing colours and materials that match their costumes. The use of naruko is required in traditional yosakoi dance, but many groups also use other hand-held instruments or props, such as drums, other percussion instruments, flags, batons and floats.”