Nature almost never builds in a straight line. Rivers bend, shells spiral, dunes roll, and the human body is a set of soft arcs. We spent nearly all of our history surrounded by those forms and only the last few centuries inside boxes, so when a building curves, something in us tends to relax. A curve in architecture is rarely just decoration. More often it is doing real work, carrying load, steering a breeze, softening light, or simply making a room feel kinder to be in. Used well it is one of the most powerful tools an architect has, and the craft is in doing it beautifully while keeping the build within budget.
A year of chasing curves
Early in my career I won the Eric Parker Scholarship and spent a year travelling the world to study curves in architecture. I went with a pen and a sketchbook rather than just a camera, because drawing a building by hand makes you understand it in a way a photograph never will. When you sketch an arch you have to follow every line to see where the load goes and why the shape holds. By the end of the year I had filled book after book, sitting on the ground in front of buildings I had only ever seen in lectures.
I drew Antoni Gaudí in Barcelona, where the serpentine bench of Park Güell rolls around the terrace in one long unbroken curve and barely a single line is left straight.
I drew the riads and palaces of Morocco, where generations of builders turned the arch into pattern, shade and welcome.
And I drew Santiago Calatrava in Valencia, an architect who trained as an engineer and builds curves the way a skeleton is built, every rib carrying its share.
The trip took me from the Rialto in Venice to the Dancing House in Prague, from Renzo Piano's great curved roof in Osaka to the quiet concrete chambers of Tadao Ando in Japan. Almost everywhere I went, the buildings people had travelled across the world to stand inside were the ones that had embraced the curve.
We are wired to respond to curves
There is real science behind that feeling. In a now famous experiment the neuroscientist Moshe Bar showed people the same objects drawn with either sharp or softly rounded edges, and they reliably preferred the rounded ones. Later brain scans showed why: the sharp versions provoked more activity in the amygdala, the part of the brain that watches for threat. Our oldest instincts read a sharp edge as danger, a thorn or a tooth or a blade, and read a smooth curve as safe. A 2013 study in the Proceedings of the National Academy of Sciences found that people consistently judged curved rooms as more beautiful than rectilinear ones, and that curved spaces engaged the parts of the brain tied to reward and feeling. I try not to oversell this, because the research is honest about its limits, and it may be that we are not so much drawn to curves as quietly wary of edges. But the pull is real, and you feel it the moment you step into a curved room.
You feel it most in a space built to be experienced. When I sat sketching inside Tadao Ando's Chichu Art Museum, the soft top light and the curved concrete made a room the whole body answers to, not only the eye.
Curves are also lovely to touch. A rounded wall or a softened sill invites the hand, where a sharp corner is the thing you steer a small child away from. This is part of what people mean by biophilic design, the idea that we feel calmer among the forms and materials of the natural world. The strongest evidence is really about contact with nature itself, a green view or good daylight or timber underfoot, but the curved, organic shapes of nature seem to carry a little of that same ease indoors.
A curve can do real work
The curves I find most satisfying are the ones that earn their place in the structure, and the oldest of them is the arch. An arch, a vault or a dome carries its load in compression, pushing the forces around its own curve instead of fighting them, which is how a slender stone bridge can stand for five hundred years.
Gaudí found these shapes with models made of hanging chains and small weights. A chain left to hang settles into the perfect line for its load, and turned upside down that same line becomes an arch that stands in almost pure compression. The same logic lets engineers build shells of concrete only a few centimetres thick that span tens of metres, and let Buckminster Fuller wrap enormous volumes in featherweight geodesic domes. When a curve follows the line of force it is the efficient choice, not the expensive one, which is exactly what Renzo Piano's roof does as it sweeps the length of Kansai airport.
I use that thinking in my own work. The Woven Museum I designed for King Edward Park is a timber structure that bends and weaves over the gallery, worked out first as a model built by hand, so that the shape and the structure are a single idea.
Curves also move air. In the Wadalba duplex the external walls are not shaped for looks alone. On the side that catches the prevailing breeze they arc inward to funnel air through the living spaces, so the house ventilates itself for most of the year without air conditioning, and the same curves give each home a sheltered, private courtyard.
And curves change how light behaves. Where a flat wall meets daylight with a hard line and a sharp shadow, a curved wall or a vaulted ceiling lets the light graze and wrap across the surface, so it arrives soft and even and shifts gently through the day. In my Forest House concept the plan bends around a mature oak so that every room frames the tree and the daylight follows the curve into the heart of the house.
The honest part, acoustics, cost and craft
Curves are powerful, which means they have to be used with care. Acoustics is the clearest case. A convex curve, one that bulges toward you, scatters sound beautifully and softens echo, which is why so many acoustic panels are curved. A concave curve does the opposite. It gathers sound toward a point, the way a satellite dish gathers a signal, and in a large room that can create echoes and dead spots. The Royal Albert Hall famously had to hang dozens of saucer shaped diffusers beneath its domed ceiling to cure exactly this. A curve is a tool, and like any tool it helps or hurts depending on how you aim it.
Cost is the other honest conversation. Curved construction usually costs more than straight, because curved formwork, joinery and cladding take more skill and more hours to make. So I do not curve everything. I choose where a curve will do the most good, in the structure or for the people in the room, and I keep the rest calm and simple. The right material helps enormously. Strawbale wants to be curved, so the curves in my Narara house came almost for free. And at the Long Jetty duplex I showed that curves need not carry a custom budget at all. That project was built as complying development, which sets strict limits on setbacks, height and floor space but says nothing about whether a building has to be a rectangle, so I gave it curved walls and a flowing roofline that meet every number while looking nothing like a standard duplex.
I am wary of one claim you often hear, that curves automatically save energy. They do not, on their own. What saves energy is a compact, well oriented building, and a simple box can manage that as well as a curve. A curve earns its keep when it is steering a breeze, catching the winter sun or shading a summer wall, and only when it is designed around the sun and the site. The shape has to be doing the work.
From the sketchbook to the Coast
Those years of drawing other people's buildings taught me how to design my own. The undulating balconies I sketched in Germany are first cousins of the wave that wraps my Wave Apartments at Terrigal, where a curved timber screen takes its cue from the ocean it looks out over.
And the Gaudí I drew in Barcelona lives on in the strawbale home at Narara Ecovillage, where the clients asked for something that felt like Gaudí meets mid century cool, but eco, and the bending strawbale walls finally let me build the kind of curve I had spent a year admiring.
That same love of the curve runs through much of my work on the Coast. At The Outlook at Phegans Bay the residences step down the hillside as a stack of rounded, timber wrapped balconies, each one curving to hold the view across Brisbane Water.
In my Long Jetty luxury residences a timber ceiling rolls overhead in a single slow wave, carrying the eye straight out to the ocean.
From a strawbale house that bends like a living thing, to a duplex that breathes through its walls, to an apartment building shaped like the sea, the curve keeps proving that it belongs in good architecture. Used with care it makes a building stronger, calmer and more human, and it can be done within a real budget.
If you would like a home or a project with a little more soul in its lines, I would love to talk it through with you.