Unveiling the Koshin Mound: Stones, Souls, and Monkeys
If you have wandered the backstreets of Kyoto, the slopes of Kamakura, or even certain older neighborhoods in Tokyo, you have likely encountered them: weathered stone tablets standing silently at crossroads. Often etched with the image of a fierce, multi-armed deity or three monkeys covering their eyes, ears, and mouths, these markers are known as Koshin-zuka (Koshin Mounds) or Koshin-to (Koshin Towers).
While they may look like simple roadside shrines to the untrained eye, these stones represent a fascinating blend of Taoism, Buddhism, and Shinto folklore that dictated the sleeping habits of the Japanese people for centuries.
The Origins of the Koshin Faith
The Koshin faith (Koshin-shinko) is not originally Japanese; its roots dig deep into Chinese Taoism. The belief system centers on the sexagenary cycle—a 60-unit cycle used for keeping time in East Asia. The name “Koshin” refers to the 57th day of this 60-day cycle.
Introduced to Japan as early as the Heian period (794–1185), the practice was initially an aristocratic ritual adopted by the Imperial Court. However, by the Edo period (1603–1867), the Koshin faith had permeated the common classes, transforming from a solemn court ritual into a community-building social gathering known as the Koshin-ko.
These stone mounds were erected by local fraternities (groups of neighbors) to commemorate the successful completion of these rituals over several years. They served not only as spiritual guardians but also as boundary markers for villages, protecting the inhabitants from evil spirits entering from the outside.
The Legend of the Three Corpses
Why were these stones erected, and what were the people praying for? The answer lies in a rather unsettling legend regarding the human body.
According to Koshin belief, three spiritual worms—known as the Sanshi (Three Corpses)—reside within every human being. These entities are essentially supernatural spies. On the night of Koshin (which occurs once every 60 days), the Sanshi leave the human body while the host is asleep. They ascend to the heavens to report the person’s sins and misdeeds to the celestial god, Tentei (the Lord of Heaven).
Based on this report, Tentei would shorten the individual’s lifespan. The more sins reported, the sooner the person would die.
The All-Night Vigil
To prevent the Sanshi from making their report, the solution was simple yet demanding: do not sleep.
This practice, called Koshin-machi, involved villagers gathering in a designated house to stay awake all night. They would chant sutras, eat, drink sake, and entertain each other until sunrise. If the host remained awake, the Sanshi could not leave the body, the report could not be filed, and the individual’s life would be spared.
The Three Wise Monkeys
The most iconic symbol found on Koshin mounds is the trio of the Three Wise Monkeys: Mizaru (see no evil), Kikazaru (hear no evil), and Iwazaru (speak no evil).
While popular globally today, their association with Koshin is largely a play on words. In Japanese, the negation “-zaru” sounds like “saru” (monkey). Therefore, the monkeys symbolize the refusal to see, hear, or speak of others’ faults—or perhaps, a plea to the gods not to see, hear, or speak of the humans’ sins.
Often, the monkeys are carved beneath Shomen-Kongo, a fierce, blue-faced Buddhist deity who protects believers from the Sanshi and illnesses. In Shinto syncretism, the deity is often associated with Sarutahiko Okami, the god of crossroads (whose name also contains the word for monkey).
Modern Culture and Preservation
In modern Japan, the strict observance of the all-night vigil has largely vanished, fading away during the modernization of the Meiji era. However, the physical legacy remains. Thousands of Koshin mounds still dot the Japanese landscape, often cared for by local neighborhood associations.
Today, these stones are appreciated less for their supernatural protective powers and more for their historical and artistic value. They serve as silent storytellers of a time when communities were tightly knit, bound together by the shared fear of divine judgment and the shared joy of a sleepless night of feasting.
Pop culture continues to reference the imagery derived from Koshin beliefs. The Three Wise Monkeys are now a universal emoji set and a motif found in art worldwide, though few realize their origin lies in an attempt to silence magical worms.
Traveler’s Tips: Finding Koshin Stones
If you wish to find these mystical markers during your travels in Japan, keep these tips in mind:
- Where to Look: Koshin mounds are often located at old intersections (crossroads were considered spiritual borders) or near the entrance of older temples.
- Sugamo, Tokyo: One of the most famous locations is the Koshin-zuka station area in Sugamo. Nearby, the Sugamo Koshin-zuka is a well-preserved site that still draws visitors.
- Kyoto’s Yasaka Koshin-do: This is perhaps the most colorful and