How do you design an airport where calm is the most logical response?
Think about the last time you walked through an airport. The signs hurrying you along, the queues that shrink you down to a number, the announcements keeping you on edge, the long march from security to gate with your shoulders somewhere up around your ears. And then, at the end of all that, the airline emails you a survey asking how stressed you felt. It is almost funny. The whole place was built to process you like livestock, and then it asks why you did not enjoy the experience.
So here is a question worth sitting with. What would it take to design an airport where the natural, easiest response was not stress but calm? Singapore's Changi Airport went and answered it, and the answer is more useful than it first appears, because the same thinking applies to any space you put people in and then wonder why they behave the way they do.
What Changi did
In late 2023, Changi reopened Terminal 2 after a five-year redesign by the Paris firm BOIFFILS Architectures. The brief they set themselves was unusual.[1] Most airport projects optimise the flow of passengers, how to move the maximum number of bodies through the building per hour. BOIFFILS deliberately did the opposite, putting the traveller's experience ahead of the logistics of processing them. The terminal that came out the other side does not look like an airport at all.
At the centre of the departure hall stands the Wonderfall, a digital waterfall fourteen metres high, set into a vertical garden. Several times an hour the water reverses and climbs, a three-and-a-half-minute show set to music written for the space by the pianist Jean-Michel Blais. Around it, more than twenty thousand real plants from over a hundred species. Green columns instead of bare pillars. Ceilings and walls that echo natural landforms. Check-in is gathered into open islands rather than the usual long wall of desks. Where a normal terminal hits you with hard lines, queues and signs telling you to hurry, this one does the opposite. It tells your nervous system that here, you are allowed to breathe.
Why this is design, not a personality test
It would be easy to assume the calmer travellers at Changi are simply calmer people, the sort who have time to admire a waterfall. That gets it backwards. The same harried business traveller who tenses up in one terminal relaxes a little in this one, and nothing about them has changed between the two. What changed is the building. The environment is doing the work, and the person is responding to it, usually without noticing they are being influenced at all.
This is the move worth taking out of the airport and into your own world. When people are stressed, distracted or short with each other in a space you are responsible for, the instinct is to treat it as a problem with the people. Changi is a reminder that the room is very often the thing talking.
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The science: attention, restored
There is solid behavioural science underneath the waterfall, and it is not decoration. Stephen and Rachel Kaplan, environmental psychologists at the University of Michigan, developed what they called Attention Restoration Theory. Their finding, built up over years of studies, is that the kind of attention we use to push through a demanding environment, the effortful, directed focus that airports drain out of you, is a limited resource that gets depleted.[2] Exposure to nature, even modest exposure, even an image of it, lets that depleted attention recover, and measurably lowers physiological markers of stress.
There is a second principle in the layout. The psychologist William Hick showed, back in the 1950s, that the time it takes a person to make a decision grows with the number of options in front of them, a relationship now known as Hick's Law.[3] A wall of identical desks and competing signs forces a tired traveller to process too many choices at once. Breaking check-in into clear islands cuts the number of decisions you face at any one moment, and lowers the mental load that comes with them. The calm is engineered, decision by decision, plant by plant.
Through a Behavioural Design lens: shaping the autopilot
It is worth naming the discipline here, because Changi is a clean example of how behavioural design actually works. Most attempts to change how people feel or behave aim at the conscious, deliberate mind: the announcement, the instruction, the survey, the sign asking you to be patient. That conscious mind is what the psychologist Daniel Kahneman called System 2, and it is slow, easily tired, and not in charge of nearly as much as we like to think. Most of what we do runs on System 1, the fast, automatic part that simply responds to whatever the environment puts in front of it.
A stressful airport hammers System 2 with demands while quietly winding up System 1 with every harsh light and hurrying sign. Changi went the other way. It left the instructions aside and redesigned what System 1 was responding to: water instead of noise, greenery instead of glare, open islands instead of walls. Nobody reads a sign telling them to relax and then relaxes. They just find themselves calmer, because the autopilot is responding to a calmer set of signals. That is the heart of behavioural design. You do not lecture the conscious mind into compliance. You change what the automatic mind is reacting to, and let the behaviour follow.
What this means in practice
Start with your own surroundings, because this works at the scale of a single desk before it works at the scale of a terminal. If you spend your day in a space that is all hard light, noise and visual clutter, you are paying a quiet tax on your attention and your mood, and willpower will not cover it. The useful response is not to try harder to focus. It is to change what your nervous system is soaking up all day: get some daylight, put something green in your eyeline, cut the number of things competing for your attention at once.
For anyone who leads people, this reframes a responsibility that is easy to overlook. You put effort into motivation, feedback and targets, all of it aimed at the conscious mind, while the physical space your team sits in is shaping their stress and focus every hour beneath anyone's awareness. The cramped, windowless room where you hold hard conversations is making its own argument. A leader who takes this seriously treats the environment as part of how people perform and feel, not as something to leave to whoever orders the furniture.
And at the level of the organisation and its customers, Changi is proof that experience is designable rather than left to chance. Whatever space, shop, app or service your customers move through is making them calmer or more anxious, more trusting or more guarded, before a single word of yours is read. The skill this points to, and it is one you can build, is to stop asking how to tell people to feel something, and start asking what the environment is already making them feel, and how to design that on purpose.
What you can design this week
You cannot install a waterfall, but the underlying move scales down to almost any space you influence. Three ways to start:
Subtract before you add. Changi removed queues and hard lines before it added greenery. Look at the space your people or customers move through and take away the harshest stressors first: the clutter, the noise, the unnecessary decisions stacked on top of each other.
Put nature in the line of sight. A plant, a window, a view of something living is not decoration; the Kaplans showed it restores depleted attention. Where people need to recover or concentrate, give them something natural to rest their eyes on.
Cut the decisions you force on people at once. Hick's Law is working against you wherever choices pile up. Break a daunting wall of options into clearer, smaller steps, so the automatic mind is not overwhelmed before it begins.
Changi did not ask anyone to relax. It built a terminal where relaxing was the easiest thing left to do, and got out of the way. That is the difference between demanding a feeling and designing for it, and it is just as available to a meeting room or a shopfloor as it is to one of the most admired airports in the world.
Want to learn to read a space for what it does to the people inside it, and design it on purpose? That is the heart of our Behavioural Design training. Details on the SUE website.
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