Tower of the Sun: A Monumental Icon of Japan's Artistic Spirit
Rising 70 meters above the green expanse of Expo '70 Commemorative Park in Suita, Osaka, the Tower of the Sun stands as one of the most recognizable landmarks in all of Japan. Designed by the legendary avant-garde artist Taro Okamoto for the 1970 Japan World Exposition, this extraordinary monument was originally intended to serve as the centerpiece of the Expo's Theme Pavilion. More than half a century later, it has transcended its original purpose to become a cultural symbol of Osaka, a designated Important Cultural Property of Japan, and a must-visit destination for travelers seeking to encounter the intersection of art, architecture, and history.
Historical Background: Birth of a Landmark
The 1970 Japan World Exposition, commonly known as Expo '70 or the Osaka Expo, was a watershed moment in modern Japanese history. Held in the Senri Hills of Suita City under the theme "Progress and Harmony for Mankind," it was the first World's Fair ever hosted in Asia. Over its 183-day run, the Expo attracted approximately 64.21 million visitors—a staggering figure that underscored Japan's emergence as a global economic and cultural powerhouse during the era of rapid economic growth.
At the heart of the Expo's Symbol Zone stood the Theme Pavilion, conceived as the venue's philosophical and artistic core. The celebrated architect Kenzo Tange designed a colossal "Big Roof" measuring 292 meters long, 108 meters wide, and approximately 40 meters high to cover the central Festival Plaza. It was into this grand structure that Taro Okamoto placed his audacious creation—a tower that literally pierced through the roof, its peak jutting skyward and its arms stretching wide as if embracing all who entered the fairgrounds.
Okamoto, born in 1911 in Kawasaki, Kanagawa Prefecture, had spent a formative decade in Paris studying philosophy, sociology, and ethnology alongside figures such as Georges Bataille. His artistic vision fused primitivism with modernism, and he approached the Expo commission with characteristic defiance. Rather than celebrating technological progress, Okamoto sought to affirm the raw, primal energy of human life. The result was a structure unlike anything the world had seen before.
Why It Was Designated a Cultural Property
The Tower of the Sun first received recognition as a National Registered Tangible Cultural Property in August 2020, marking the 50th anniversary of its construction. Then in May 2025, the Agency for Cultural Affairs' Council for Cultural Affairs recommended its designation as an Important Cultural Property, a significantly higher classification. The registration as a Tangible Cultural Property was subsequently cancelled upon the Important Cultural Property designation in August 2025.
The designation recognizes the tower on multiple grounds. First, it is praised as technically outstanding—the realization of Okamoto's extraordinary artistic vision required the collaboration of leading scholars, engineers, and builders who employed the most advanced construction technologies of the era. The tower's complex form, combining reinforced concrete, steel framing, and lightweight shotcrete sections, represented an engineering feat that would be extremely difficult to replicate. Second, it holds exceptional historical value as a monumental legacy of the 1970 Osaka Expo, symbolizing Japan's high-growth era and the nation's aspirations during a transformative period. The designation also encompasses the Tree of Life sculpture inside the tower and the original construction drawings preserved at the Expo '70 Commemorative Park office.
Architectural Highlights and Artistic Features
The Three Faces
The tower's most striking feature is its three visible faces, each symbolizing a different dimension of time. At the very top, the Golden Mask gleams with metallic brilliance, representing the future. Originally constructed from 337 steel plates, the mask was replaced with a second-generation stainless steel replica in 1992 due to weathering. The Face of the Sun, located at the center of the tower's front, represents the present. Crafted from glass fiber reinforced plastic (FRP), this face bears Okamoto's distinctive artistic touch—he personally visited the factory to sculpt and refine its contours by hand. On the rear of the tower, the Black Sun symbolizes the past. This approximately 8-meter-diameter face is composed of around 3,000 Shigaraki-ware ceramic tiles, a testament to Okamoto's deep connection with the pottery traditions of Shiga Prefecture.
The Fourth Face: The Underground Sun
A mysterious fourth face, known as the Underground Sun, was originally installed in the subterranean exhibition space called "Inori" (Prayer). After the Expo closed and the underground facilities were dismantled, this face went missing and has never been recovered. A reconstructed version was created during the 2016–2018 restoration and is now on display in the tower's underground gallery, accompanied by projection mapping that brings it to life in ever-changing colors.
The Tree of Life
Inside the hollow tower, visitors encounter one of the most awe-inspiring art installations in Japan: the Tree of Life. This steel sculpture rises approximately 41 meters through the tower's interior, its trunk and branches adorned with models of living organisms representing the entire arc of biological evolution—from single-celled amoebas at the base to dinosaurs, mammals, and finally humans near the top. During the original Expo, 292 organism models of 33 species were displayed. The 2018 restoration faithfully recreated 183 models of 33 species, using modern techniques including LED illumination to enhance the sense of primordial life energy that Okamoto intended visitors to feel.
Structural Innovation
The tower's construction was a remarkable feat of engineering. Three major general contractors joined forces, employing shipbuilding techniques to create the steel-reinforced concrete structure. The tower's unusual and complex shape initially raised doubts about whether it could even stand at 70 meters while meeting seismic standards. Engineers created a replica of Okamoto's one-hundredth-scale plaster model, sliced it into one-centimeter cross-sections, and translated those into engineering drawings. The jagged red motifs on the tower's front surface represent thunder, while the overall form—with its outstretched arms and piercing posture—embodies what Okamoto described as a desire to build something primordially powerful that connected the ancient with the contemporary.
Visiting the Tower of the Sun
The interior of the Tower of the Sun has been open to the public since March 19, 2018, following a major restoration project that included seismic reinforcement and exhibit restoration. Admission is by advance reservation only—visitors must book at least one day ahead through the official website. Upon arrival, visitors present their QR code and identification at the reception counter at least 20 minutes before their scheduled tour time.
The guided tour takes visitors through the underground gallery, where the restored Underground Sun and projection mapping welcome them into Okamoto's vision of a primal, spiritual world. From there, visitors ascend via stairways alongside the magnificent Tree of Life, gazing up at the illuminated organism models and the colorful Space of the Sun ceiling. The experience culminates at the arm level, where Okamoto's original production notes and sketches are displayed.
Adjacent to the entrance, a museum shop offers a wide range of Tower of the Sun merchandise, from miniature figures to masking tape and clear files. The shop is accessible during operating hours without a tower reservation.
Surrounding Attractions
The Tower of the Sun is situated within Expo '70 Commemorative Park, a vast green space spanning approximately 264 hectares that was created on the former Expo grounds. The park offers numerous attractions that complement a visit to the tower.
- EXPO '70 Pavilion: Housed in a former Expo steel pavilion, this museum preserves photographs, artifacts, and multimedia displays documenting the 1970 World Exposition, offering visitors an immersive journey back to that historic event.
- Natural and Cultural Gardens: Expansive gardens featuring seasonal flowers, cherry blossoms in spring, and stunning autumn foliage, providing a picturesque setting for walks and picnics.
- Japanese Garden: A beautifully designed traditional garden within the park, showcasing classical Japanese landscaping techniques across different historical periods.
- National Museum of Ethnology: One of the world's largest ethnology museums, housing approximately 345,000 items from cultures around the globe, located adjacent to the park.
- EXPOCITY: A large-scale commercial complex adjacent to the park offering shopping, dining, entertainment, and attractions including NIFREL, an experiential museum combining art and living creatures.
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Q＆A
- Do I need a reservation to enter the Tower of the Sun?
- Yes, admission to the interior of the Tower of the Sun is by advance reservation only. Reservations must be made at least one day in advance through the official website. On the day of your visit, you will need to present your QR code and a valid ID at the reception counter. If space is available, same-day tickets may occasionally be sold.
- What are the three faces on the Tower of the Sun?
- The tower has three externally visible faces representing different dimensions of time: the Golden Mask at the top symbolizes the future, the Face of the Sun on the front represents the present, and the Black Sun on the rear signifies the past. A fourth face, the Underground Sun, is displayed inside the tower's underground gallery.
- How do I get to the Tower of the Sun?
- Take the Osaka Monorail to Banpaku-kinen-koen Station, then walk approximately 15 minutes to the tower. You can transfer to the monorail from Hankyu Kyoto Line stations such as Minami-ibaraki, Yamada, or Hotarugaike.
- What is the Tree of Life inside the tower?
- The Tree of Life is a towering steel sculpture approximately 41 meters high located inside the tower. Its branches display models of living organisms representing the evolution of life on Earth, from primitive single-celled organisms at the base to humans near the top. Originally featuring 292 models, the restored version displays 183 models of 33 species, beautifully illuminated by modern LED lighting.
- Is the Tower of the Sun a designated cultural property?
- Yes. The Tower of the Sun was first registered as a National Registered Tangible Cultural Property in 2020. In 2025, it was elevated to Important Cultural Property status, recognizing its outstanding technical achievement and historical significance as a monumental legacy of the 1970 Osaka World Exposition.
Basic Information
| Name | Tower of the Sun (太陽の塔) |
|---|---|
| Designer | Taro Okamoto (岡本太郎, 1911–1996) |
| Completed | March 1970 |
| Height | Approximately 70 meters |
| Structure | Reinforced concrete and steel frame (partially shotcrete) |
| Cultural Property Designation | Important Cultural Property (designated 2025) |
| Location | Expo '70 Commemorative Park, 1-1 Senri-Banpakukoen, Suita, Osaka 565-0826 |
| Owner | Osaka Prefecture |
| Hours | 10:00 AM – 5:00 PM (last admission 4:30 PM) |
| Closed | Wednesdays (open if holiday; closed following day), New Year holidays |
| Admission | Adults: ¥930 (tower + park entry), Children (elementary/middle school): ¥380 |
| Access | Osaka Monorail "Banpaku-kinen-koen" Station, approx. 15-minute walk |
| Reservations | Required (at least 1 day in advance via official website) |
| Official Website | https://taiyounotou-expo70.jp/en/ |
References
- Tower of the Sun Official Site
- https://taiyounotou-expo70.jp/en/
- Tower of the Sun — Expo '70 Commemorative Park
- https://www.expo70-park.jp/cause/expo/tower-of-sun/
- Tower of the Sun — Wikipedia
- https://en.wikipedia.org/wiki/Tower_of_the_Sun
- Tower of the Sun Important Cultural Property Designation — Osaka Prefecture
- https://www.pref.osaka.lg.jp/o070130/taiyounotou.html
- Inside The Tower of the Sun — LIVE JAPAN
- https://livejapan.com/en/in-kansai/in-pref-osaka/in-osaka-suburbs/article-a2000236/
Last verified: 2026.03.28