Japan’s Most Surprising Art Form
Japan’s municipal manhole covers — the cast iron discs set into every pavement and road surface — are remarkable public art objects. Since the 1980s, Japanese municipalities have commissioned custom designs for their sewer system covers, incorporating local landmarks, mascots, seasonal flowers, traditional crafts, and regional histories into functional infrastructure. Over 95% of Japan’s approximately 1,700 municipalities have unique manhole designs; collectors, photographers, and dedicated tourists travel specifically to document them.
The History of Japanese Manhole Art
The decorated manhole movement began in 1985 when the Construction Ministry promoted localised designs as a way to increase public acceptance of sewage infrastructure expansion. The thinking was simple: if manholes looked beautiful, fewer residents would object to construction. The strategy worked beyond expectation. By the 1990s, municipalities were competing on design quality, and the covers had become accidental landmarks. Today the culture has its own formal vocabulary: the covers are called manhouru (マンホール), collecting and photographing them is called manhouru kansou (manhole viewing), and dedicated collectors are known as manho-raa.
Design Themes
Manhole designs typically feature one of several categories:
- Prefectural flowers and trees: Cherry blossom for many municipalities, but also wisteria (Saitama), iris (Aichi), plum (Fukuoka), and dozens of regional varieties.
- Local landmarks: Castle silhouettes, famous bridges, mountain profiles, and coastlines rendered in stylised line art.
- Traditional crafts and festivals: Awa Odori dancers (Tokushima), Nebuta lantern floats (Aomori), Nishijin weave patterns (Kyoto), and kite designs (various regions).
- Anime and mascot characters: Many cities have produced limited-edition covers featuring anime characters set in their landscape, particularly in cities that are the settings for famous series.
- Historical figures and events: Samurai, historical events, and famous local personalities.
Coloured Manhole Covers
The most prized covers among collectors are the coloured versions — covers painted in accurate colours rather than left as bare cast iron. Coloured covers began appearing in the 1990s and now exist in hundreds of municipalities. The paint is specially formulated to withstand vehicle traffic and seasonal temperature cycles; some covers are re-painted every few years while others have developed a patinated appearance that collectors find more appealing than newly painted versions.
Finding and Collecting
Tourist information offices in most Japanese cities distribute manhole cover maps showing the locations of notable designs within their area. The national Manhole Summit (開催地各地) is an annual event where municipalities display their covers for collector appreciation. Digital apps including GK Stamp (for the collector community) and various local tourism apps allow GPS-based logging of covers found. The city of Matsuyama in Ehime maintains a particularly extensive collection of themed covers reflecting its Dogo Onsen heritage and local cycling culture; Kyoto’s covers incorporate the city’s grid plan and famous landmarks.
Manhole Cards
Since 2016, the Japan Sewage Works Association has issued free “manhole cards” — trading-card-sized information cards featuring the design and background of specific covers — distributed at municipal offices, tourist centres, and sewage facilities. Over 1,000 unique cards have been issued. Collecting manhole cards has become a distinct hobby, with dedicated collectors visiting each issuing location in person (cards cannot be requested by mail). The card system has driven significant tourism to small municipalities that might otherwise receive few visitors.