It is a typical tool to express the unique view of religion in Japan which is expressed in the phrase, 'God exists even in tools and tools have lives' (seen in the custom of having a memorial service for dull and broken needles and the graves for tools).
日本独特といわれる「道具にも神や命が宿る」という宗教観（針供養・道具塚）をあらわす根源的なものである。