Tunnel of Light

Throughout the year
Photo by Nakamura Osamu

Information and Map

About the artwork

As part of the 2018 program, MAD Architects was invited to revitalize the Kiyotsu Gorge Tunnel – a historic, 750-meter passageway that cuts through distinctive rock formations, offering panoramic views over one of Japan’s three great chasms. Drawing on the ‘five elements’ of nature (wood, earth, metal, fire, water), MAD’s scheme transforms points along the historic tunnel through the realization of several architectural spaces and artistic atmospheres. The designs rethink the relationship between humans and nature, and seek to re-connect locals and visitors alike with the majestic beauty of the land.

“Periscope” (wood)

Upon the approach to the tunnel, a small wooden ‘hut’ has been erected that serves as the café, souvenir shop (with locally made crafts) on the ground floor. Inside the pitched cedar roof on the upper level, is a hot spring foot spa. A circular aperture – the “Periscope” – in the ceiling opens up towards the roof. Encircled by mirrored lenses that reflect the nature of the surrounding site inwards, the subtle intervention gives visitors the opportunity to enjoy the natural scenery outdoors, while they have a foot bath and relax within the warmth of the wooden interior.

 “Expression of Color” (earth)

The entrance to the tunnel has been restored to its former glory, and leads the way to the newly renovated passage. Originally illuminated through natural means, it has been outfitted with a series of different coloured lights which define each lookout point along the tunnel. Captured as “The Expression” of the space, their vibrancy, in combination with mysterious music, sets a subtle but dynamic ambiance that sparks a certain curiosity of the unknown for those who are wandering through.

“Invisible Bubble” (metal)

The first of the lookout point renovations is the “Invisible Bubble”. As if landing from another world, the capsule-like structure gently mirrors the silhouette of the tunnel itself, while reflecting its surroundings. Functioning as a toilet, the wall which faces towards the gorge is transparent. This exterior window is covered in a metallic film that only allows one-way views from the inside out, playing with the notion of public and private. Providing a quiet escape, a place of solitude, it is an intimate space that finds itself in an openly public setting. It puts into question how people react when they think that no one is watching – an ideal corner of contemplation.


“Drop” (fire)

‘Dew drops’ are scattered along the curvature of the second lookout point. “The Drop” is a series of reflective openings that are like windows of uncertainty. While they project a reality by mirroring the natural environment, they also appear surreal, like molecules of water, they are suspended from the ceiling and walls, frozen in time. As one looks into these convex mirrors, backlit by fiery, red light, they experience an alternative connection with nature – one that is at once mysterious and warm.

“Light Cave” (water)

The culmination of the restoration is expressed in the form of the “Light Cave”. Semi-polished stainless steel lines the tunnel, drawing the distinct rock formations, lush greenery, and turquoise water of the treasured terrain, into the enclosed space. A shallow pool of water gently ripples with the breeze of the wind. In turn, the images of the gorge reflected from the cave cast themselves onto the water – an infinite illusion of nature. The essence of the “Light Cave” brings both a lightness and stillness into the once dark, dewy tunnel, invoking a feeling of everlasting solitude.

Information and Map

Artwork no. N079
Production year 2018 2021
Opening hours [1 Mar- 30 Nov] 8:30-17:00 (last entry 16:30)
[1 Dec- 28 Feb] 9:00-16:00 (last entry 15:30)

*Advance reservations are required during peak season (GW, late July - Bon Festival, late October - early November).
Admission Adults 1000 JPY, Children under 15 years old 400 JPY (Group of 20: Adults 900 JPY, Children under 15 years old 350 JPY)
Closed *Temporary closure may occur due to snowfall conditions, etc.
*Entrance facilities are open until 11/30 (closed in winter)
Area Nakasato
Village Koide
Official website https://nakasato-kiyotsu.com/en/
Open dates Throughout the year (closed during winter depending on snow conditions)
Venue Kiyotsukyo Gorge Tunnel(2119-2, Aoi, Koide, Tokamchi-city, Niigata Prefecture)

*The period is depends on snowfall. Please check here>> https://nakasato-kiyotsu.com/en/

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