Time as a Material

On Duration, Architecture, and the Discipline of Letting Things Become

Time is usually treated as something architecture should resist: we design to preserve, to protect, to maintain.

But time is not separable from space; it is one of its materials.

Time acts on space as directly as any physical element, altering texture, shifting colour, softening edges, deepening contrasts. Materials are not chosen for permanence but for transformation. And through that transformation, a building becomes an unreplicable entity.

The question is not whether a building will change.

It is whether it was designed to change well.

In Japanese architectural thought, the concept of Ma — the spatial-temporal interval — proposes that space is not a fixed container but a continuous field of becoming.¹ It is constituted by time, not merely situated within it. The identity of a room shifts according to the activities, light, and seasons that move through it. Space and time are not separate categories; they are a single condition.

The Western tradition has generally moved in the opposite direction — toward permanence, toward the monument, toward the sealed and unchanging.² And yet traditional Portuguese construction shared something essential with the Japanese model: neither treats a building as a completed object. Both treat it as a process.

Contemporary renovation often imports the logic of permanence into buildings that were never built for it.

Breathable walls are sealed. Lime is replaced with cement. The dynamic relationship between structure and climate is suppressed in favour of a controlled, stable interior.

The result is not an improved building. It is a building in conflict with itself: materials forced to perform functions they were never designed for, in an environment they cannot negotiate with.³

There is a technical failure here. But there is also a conceptual one. The assumption that a building should look the same on the day it is completed as it does twenty years later is not neutral. It is a choice, and in the context of traditional Portuguese construction, it is the wrong one.

Understanding time as a material changes the questions you ask when you renovate.

You stop asking: how do I make this look finished?

You start asking: how will this age?

Which materials will deepen with use. Which will resist climate and fail. Which interventions work with the logic of the existing structure, and which impose a foreign one. The role of design is not to freeze a moment but to guide a transformation; to make choices that remain coherent not just on completion, but across decades.

A building that has been renovated with this understanding does not look untouched. It looks considered. The new and the old are in conversation rather than in contradiction.

Time continues to move through it because the materials allow it to, and the design anticipated that it would.

Architecture, in this sense, is not a fixed object.

It is a process unfolding over time.

The building is not only what was constructed. It is what it becomes — through use, through climate, through the slow pressure of seasons on material. Time does not sit outside the building waiting to damage it.

It inhabits it.

And the quality of a space is not always in how new it feels, but in how well it holds what comes after.

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NOTES:

¹ The concept of Ma (間) designates a qualitative spatial-temporal interval — not created by the composition of elements, but taking place in the experience of the person inhabiting the space. Nitschke describes it as 'the consciousness of place.' Nitschke, G., From Shinto to Ando: Studies in Architectural Anthropology in Japan (Berlin: Ernst & Sohn, 1993). See also: Okano, M., MA: entre-espaço da comunicação no Japão (São Paulo: PUC-SP, 2007).

² Nishida, M., 'Time in Japanese Architecture' (2005): 'In the West, architecture is considered something eternal, whose foundations represent a starting point of history, and where the monument ideally registers its eternal duration. In Japan, architecture is considered rather as temporal, and the important thing is permanent re-foundation or reconstruction rather than foundation.'

³ The breathability of traditional Portuguese construction - lime mortars, stone masonry, rammed earth - is a defining technical characteristic. These materials are designed to absorb and release humidity in response to the climate, operating in dynamic equilibrium with the environment. Sealing them with cement or synthetic coatings disrupts this equilibrium, trapping moisture and accelerating structural degradation. Fernandes, M. & Correia, M. (eds.), Arquitectura de Terra em Portugal (Argumentum, 2005).