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Office · Akishima, Tokyo · Manufacturing

IHI — Akishima: an aero-engine office where every floor is a different colour of the sky

IHI built a new east building at its Akishima site to bring together the offices of its aero-engine business. The design concept is “the changing colour of the sky”: each floor has a sky colour that also tells people where they are, meeting rooms are chosen by the colour of the floor, and the lounge downstairs is furnished in the colour of dawn.

Company IHI Corporation (株式会社IHI) ↗Site Akishima Office, East BuildingLocation Akishima, TokyoCompleted March 2019 (interior)Area 10,000 m²Staff About 770Design Okamura
The 1st-floor lounge
The 1st-floor lounge

Concept

Smart, strong, supple

The move was made to run the aero-engine business more efficiently. The office concept was “smart, strong and supple”: combining departments to create new value, standardising and streamlining work, and making it easier for staff to do their best.

For an aerospace business, the colours come from the sky. Each floor has its own sky colour, which shows IHI’s character and also tells you which floor you are on.

The work floor
The work floor
The 1st-floor entrance
The 1st-floor entrance

01 · Lounge

Industrial, with the colour of dawn

The first floor has a lounge and shop for breaks and exchange, also used for short meetings with visitors. IHI asked for something “not like IHI”, so the lounge is industrial, with furniture in the colour of the morning sky, akebono. Stepped benches and movable furniture handle large meetings and parties, and there are enclosed family-restaurant booths.

Chairs in dawn colours
Chairs in dawn colours
Family-restaurant booths
Family-restaurant booths

02 · Meeting by colour

Red for debate, blue for commitment

Each meeting room on the first floor has a different floor colour, to bring the psychology of colour into play. The red room, Debate, is for lively meetings; the blue room, Commit, for calm ones.

Debate
Debate
Commit
Commit
A guest meeting room
A guest meeting room

03 · Work floors

Group address, gathered round the stair

Floors two to five were set up for group address, letting people choose a place by the day’s work. Meeting and focus areas line the windows, and copying, information exchange and mobile lockers are clustered round the central stair to bring departments together. All the desks can be moved as teams change.

Each department was trusted to lay out its own area within set rules, and staff worked out together what their space should be.

Information exchange
Information exchange
A round bench
A round bench
Lockers
Lockers

04 · By the window

Booths, glass and a dragonfly

Semi-private booths by the windows host one-to-ones. Glass rooms show who is meeting, and the collision-prevention signs on the glass carry a dragonfly and a dinosaur. In the internal meeting rooms the chair colour is a colour of the sky — in the west-facing room, yellow for dusk.

A booth
A booth
Glass meeting rooms
Glass meeting rooms
A dragonfly on the glass
A dragonfly on the glass
Dusk-yellow chairs
Dusk-yellow chairs
CompanyIHI Corporation ↗
DesignOkamura Corporation
Photography© Okamura Corporation (from Okamura’s office design case studies)
Sourceオカムラ オフィスデザイン事例, “株式会社IHI 様”, re-reported by WALL ↗
PublishedOctober 2026
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