The Secret of the Suspended Roof: The Four Divine Beasts Protecting Sumo Culture and Their History

Trivia
               

Supervisor・Tsuyoshi Mizuguchi

Former sumo wrestler Shoho Tsuyoshi (real name: Tsuyoshi Mizuguchi). He belonged to the Kasugayama stable, made his debut in 2004, and rose to the rank of Makushita East 4. He also performed the Yumitori-shiki (bow-twirling ceremony) on behalf of Yokozuna Hakuho.
After retiring, he has been actively promoting sumo culture both in Japan and abroad through organizing training sessions, producing the YouTube channel "Osumo Gucchan-neru," and hosting sumo experience events.
He appeared as the character Entori in the Netflix drama *Sanctuary* and has also participated in stage performances.
Currently, he organizes inbound sumo events and shows for international visitors, and also works as a personal trainer, sharing the appeal of sumo while supporting people’s health and well-being.

The roof suspended above the dohyo in the Kokugikan is not mere decoration but a symbol of sumo culture. Its origins date back to the days of outdoor sumo, modeled after shrine architecture. The tassels at its four corners represent the Four Divine Beasts, turning the dohyo into a sacred space.

Origins and History of the Suspended Roof

The suspended roof carries on the tradition of outdoor sumo into the present day. From the Edo to the Meiji period, sumo was often held in temple and shrine grounds, with a roof resembling a shrine building placed above the dohyo. This emphasized that sumo was not just a contest of strength but also a sacred ritual.

In earlier times, the roof was supported by pillars. However, pillars blocked the audience’s view, so in the Kokugikan, the roof is hung by wires instead. This allows the dohyo to be viewed clearly from every angle, ensuring spectators can enjoy the matches without obstruction.

EraRoof StyleFeatures
Edo PeriodSupported by pillarsModeled after shrine architecture, emphasized sacredness
Meiji–ShowaSimplified roofDesigned for outdoor events
Modern (Kokugikan)Suspended roofSupported by wires, clear view for spectators

Thus, the suspended roof represents a fusion of tradition and technology that continues to support sumo today.


The Meaning of the Four Corner Tassels

The four tassels hanging from the corners of the roof are blue, red, white, and black, representing the Four Divine Beasts of Chinese mythology. Each corresponds to a direction and a symbolic meaning, protecting the dohyo.

Tassel ColorDivine BeastDirectionSymbolic Meaning
BlueAzure DragonEastProsperity and growth
RedVermilion BirdSouthPeace and protection
WhiteWhite TigerWestCourage and determination
BlackBlack TortoiseNorthStability and longevity

These ideas are linked to cosmology and nature. By surrounding the dohyo, they elevate it from a simple stage to a sacred ritual space. For foreign audiences, learning that these tassels are not just decoration but rooted in spiritual tradition can be surprising and eye-opening.


Connection Between Shinto and the Suspended Roof

Sumo has always been deeply connected with Shinto rituals. The suspended roof is designed to resemble a shrine, emphasizing that the dohyo is a place where the gods descend. Pre-bout rituals such as throwing salt and stomping the ground are all purification rites.

Element of the RoofConnection with ShintoMeaning
Roof designModeled after shrine architectureRepresents sacred space
Throwing saltPurification ritualWards off evil
Shiko stompingStomping the earthPrayer for stability of the land

The suspended roof helps spectators and wrestlers subconsciously feel that they are competing before the gods. This turns sumo into a stage that embodies both ritual and culture, rather than just a sporting event.


Why Foreign Visitors Are Surprised

For many foreign spectators, the first surprise is not just the bouts themselves but the ritualistic atmosphere surrounding sumo. The suspended roof resembles a shrine stage, giving the dohyo a mystical aura.

Spectator PerspectiveSurprising AspectWhat They Learn
Visual impressionRoof and tasselsCreates a sacred atmosphere
RitualsSalt throwing, stompingReligious significance
TheatricalityWrestler entrancesDramatic, ceremonial mood

Thus, the suspended roof transforms sumo into an experience beyond sport, offering cultural depth and spiritual resonance.


The Suspended Roof and Architectural Technology

The suspended roof is not only visually striking but also a product of advanced architectural design. Lightweight materials and strong wires are used to support the massive roof, while also ensuring earthquake resistance in Japan.

The angles and shape of the roof are carefully designed to avoid obstructing the audience’s view. This balance of traditional design with modern engineering allows sumo to maintain its ancient ritual atmosphere while adapting to large modern venues. The suspended roof is truly a symbol of both tradition and innovation.


Conclusion

The suspended roof in the Kokugikan is a fusion of history, spirituality, and architecture. Its origins trace back to outdoor sumo, where shrine-like roofs emphasized the sacred nature of the bouts. The tassels symbolize the Four Divine Beasts, protecting and sanctifying the dohyo.

At the same time, modern construction techniques ensure safety and visibility for spectators. For beginners and foreign fans, understanding the meaning of the suspended roof is the key to appreciating sumo not only as a contest of strength but also as a sacred tradition passed down through generations.

The suspended roof is far more than decoration. It is a microcosm of Japanese culture, embodying faith, history, and innovation all in one.

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