The practice of holding memorial services for tools and living things that had served their purposes derived from the belief that such things would become violent Tsukumogami if people treated them without due respect or did not hold memorial services for them.
また粗末に扱ったり供養を絶やすと、付喪神となり荒ぶるとする考えから、役目を終えた道具や生き物に対する供養を行う習慣につながっている。