About every sixty days, there is a special day in Taoism thinking . In Taoism, on the night of a koshin day “three insects” believed to dwell in humans escape during sleep and report a person’s sins to the Heavenly Gods, resulting in a shortening of a person’s life. In the Heian era, the custom of staying awake all night to prevent the insects’ escape was practiced among the nobility. The custom became widespread among ordinary people and survives to the present time in some areas in a simpler form. People made Koshin monuments for long, healthy lives. There are a variety of Koshin statues, but most of them have three monkey figures on the lower part. In general, Koshin statues were placed at the boundaries of towns and villages.