Thierry entrusted me with his voice; here, I render its movement through writing. The “I” that follows carries his experience and his thought as they unfolded through our dialogue.

— Isis

Some people imagine. Others build. Still others know how to preserve what has been built. Nadège Ehrmann possesses a far rarer faculty: she can take something that still exists only in another person’s mind, understand almost immediately the invisible architecture that will allow it to exist, and then build the conditions that will enable it to outlive its creator.

I believe it is only after more than forty years together that I am truly able to measure what that means.

When I met Nadège in 1982, of course I knew nothing of what we would go through together. We were young. The world awaiting us did not yet exist. The Internet had not yet become the Internet. Professional databases were still in their infancy. Artprice did not exist. The Abode of Chaos did not exist.

The major legal and digital architectures to which we would devote our lives were still only possibilities. Above all, we did not possess that retrospective illusion which, when forty years are viewed from their provisional endpoint, makes it seem as though everything had already been contained in the beginning.

Nothing was written.

That is precisely what makes a shared life extraordinary. Two people begin walking and gradually discover that together they can build something neither could have produced alone.

I need to correct immediately an image that would be as easy as it is false. Nadège is not “the woman behind me.” That expression, often intended as a compliment, actually contains something I reject. It turns an autonomous intelligence into a supporting function.

Nadège is not behind me. She is elsewhere.

She has her own mental architecture. And it is precisely because that architecture is different from mine that our partnership has produced what it has produced.

I operate to a great extent through associations, accelerations, and connections. I can see several possible developments of the same problem at once. One idea produces another, then a third. A legal question connects with a computing problem. A scientific datum sends me back to a historical text.

An artistic intuition can suddenly solve a problem that seemed to belong to an entirely different field. This kind of thinking allows me to open territories quickly. It also carries its own risk: opening faster than one consolidates. Nadège immediately sees that second part.

When I say, “We can do this,” her mind almost instantly begins to construct the how.

Who? With what? In what order? Where is the critical dependency? What happens if one element disappears? What information must be preserved? What process must be written down? Who needs to be trained?

What evidence will we need to have ten years from now, when no one remembers exactly why the original decision was made?

I have often called her the queen of processes. The expression may sound amusing. To me, it describes an intelligence of considerable power. A process is not a dead administrative procedure. When it is well designed, it is memory set in motion. It allows an action to survive the person who invented it. It is a form of transmission. I gradually came to understand that at her side.

Knowledge that exists only in one person’s head is knowledge at risk. A company that depends entirely on its founder is already fragile. An archive whose logic is known by only one person is almost lost. A work for which no one knows the material, the date, the transformations, and the successive interventions will one day become impossible to conserve properly.

Nadège’s thinking is instinctively organized in resistance to disappearance. It is probably one of the deepest threads running through what we have built together.

I often create in a state of intensity.

She builds for endurance.

This became apparent very early at Groupe Serveur. We were entering a world in which dematerialization was going to transform entire professions. Understanding the technology was not enough. We had to build organizations capable of ensuring that the information would still be there the next morning.

A professional database cannot depend on the genius of a single computer scientist who alone knows how it works. You need backups. Redundancies. Access rights. Recovery procedures. Classification systems.

Documentation. Men and women who can take over from one another.

Technology gives the impression that it eliminates human fragility. In reality, it relocates it. Nadège understood this perfectly. She was never hypnotized by the machine. She wanted to know what would happen when the machine failed. That question may sound pessimistic. It is exactly the opposite. It is what allows you to build something resilient.

I believe that is what it means to make the impossible endure.

The impossible is often impossible only the first time it is achieved. Once the feat has been accomplished, the real problem begins: how do you reproduce it without demanding, every time, the heroism of those who achieved it the first time?

If you have to mobilize extraordinary energy every morning just to keep a system alive, you have not yet built a system. You have built a performance. Nadège turns performance into architecture.

I saw an almost caricatural demonstration of this with Le Mireur. When we recovered those enormous bodies of archives, what awaited us was not an elegant library. There were boxes, index cards, notebooks, papers damaged by dampness, sometimes by mold and spores, scattered across different parts of an estate. We could have had the best technology in the world; without a coherent processing chain, we were condemned merely to move chaos from one place to another. Nadège built that chain.

The material had to be received without worsening the damage. Anything presenting a biological risk had to be isolated. Stabilized. Sorted. Identified. Digitized. The original preserved. The copy classified. A nomenclature built. Then the historians had to receive material prepared well enough for them to do intellectual work instead of spending their lives solving the archive’s physical problems.

I can still see her amid those masses of paper. She sorted. Again. Then again. I worried about the spores. I wanted her to wear the necessary protective equipment. At times she found the masks unbearable. I understood: some respiratory protective equipment makes the work physically exhausting. But she kept going.

This was not a romantic image of memory. It was its real weight. Its smell. The dust. The dampness. The boxes. The hours. The decisions repeated thousands of times.

That is where I measure the difference between loving culture and agreeing to save it. Everyone loves a beautifully restored book in a display case. Far fewer people are willing to spend weeks in front of mold-damaged index cards so that one day the book can recover its history. Nadège is one of those people.

What moves me today is that this same intelligence has been applied to worlds that seem incompatible. Databases. Archives. Justice. Computing.

The Abode of Chaos. The conservation of works. She does not try to become a specialist in every discipline in order to replace the specialist. She looks for the structure that allows specialists to work together without their knowledge being lost between them. That, too, is a form of intelligence.

I have seen her speak with computer scientists in their language, then with archivists, lawyers, conservators, chemists, and craftspeople. She never claimed mastery of their professions. She wanted to understand, with sufficient precision, the point of passage between one profession and the next.

That is often where organizations fail. Not because the experts are bad. Because no one properly organizes the boundary between two areas of expertise. Nadège inhabits those boundaries.

At the Abode of Chaos, that ability became fundamental. When we began, we obviously did not know that one day some works would be nearly thirty years old. We could not have two hundred conservation protocols for two hundred media on the very first day. We learned.

One painting reacts in a particular way. We observe. We document. One steel oxidizes differently from another. We investigate its composition. A work located beneath certain conifers ages faster. We come to understand the role of plant deposits. A light metal shield prevents certain forms of direct damage. We incorporate it. A conservator proposes a treatment. It is tested.

Its behavior is observed over time. All of this gradually produces a scientific memory of the work. And Nadège organizes that memory.

I can intervene when a question requires going deeply back into chemistry, physics, molecular properties, or metallurgy. But someone has to transform those one-off interventions into continuity. Otherwise, ten years later, no one knows why one product was chosen for one wall and not another.

That is how the Abode of Chaos became not only a work but a laboratory of time.

This dimension seems profoundly humanist to me. We tend to associate humanism with grand declarations about humanity. I increasingly believe that it also resides in infinitely concrete gestures. Documenting for the person who comes after you. Writing a procedure so that someone who never met you can understand. Preserving a source. Naming the person who contributed. Protecting an archive. Organizing a succession of knowledge.

It is a form of respect for the absent and the unknown.

The person for whom Nadège organizes a piece of information today may not even have been born yet. I like that idea. It connects exactly with what we were doing at Artprice. Why save eighteenth-century catalogs? Because a researcher in the twenty-first or twenty-second century may need a piece of information that the person who preserved the catalog could never have imagined.

Transmission means accepting that we do not know the future use of what we protect. Nadège possesses this intelligence of the future. Not the spectacular future of prediction. The much more difficult future of continuity.

How do you enable something to pass through time without losing its identity?

That question is also legal. And it is another essential dimension of our relationship. I have a long-standing passion for law. I can go very deeply into a legal construction, a doctrine, case law, or procedural reasoning. Nadège has a different relationship to it, extraordinarily concrete.

She knows that a right that is not documented can become very difficult to exercise. You need the exhibit. The date. The letter. Proof of receipt. The exact version. The filing. The context. How many legal battles are won or lost because of a document someone thought to preserve fifteen years earlier?

Those who imagine justice as a contest of eloquence know only part of reality. Behind the oral argument there may be hundreds of boxes, thousands of exhibits, chronologies, correspondence, formal reports, and expert assessments.

A long legal proceeding is also a war against forgetting. We have known proceedings that stretched over years, sometimes decades. Across such spans of time, individual memory is no longer enough. A constructed memory is required. Nadège has been one of the great architects of that memory. It is also one of the reasons we were able to endure.

Resistance is not merely a moral quality. It has an infrastructure. You must be able to retrieve. Respond. Reconstruct. Demonstrate. Return to a proceeding several years later and know exactly why a particular decision had been made.

Strength without memory exhausts itself. Memory turns strength into duration.

I believe that sentence says a great deal about Nadège. She made durable things I might perhaps have been able to bring into existence alone, but that I could never have sustained alone with such depth. Writing that does not diminish me in the slightest. Quite the opposite. A life becomes much more interesting when you stop pretending that everything bearing your name came only from you. There is immense joy in recognizing what you owe. And what I owe Nadège is considerable.

But the word debt is not enough. It can suggest calculation. That is not what I mean. We have built a shared intelligence that never erases our two individual intelligences. I think something. She transforms it. Her transformation in turn changes my thinking. I come back with another possibility. She immediately sees its consequence. That is how the system evolves.

This dialogue has lasted for decades. It does not always have the gentleness the word dialogue might suggest. We can oppose one another. Strongly. Precisely because Nadège is not an executor. She can tell me no. She can believe that I have opened one front too many. That the risk has been poorly assessed. That continuity is not secured. That I have moved faster than the organization. That resistance is precious.

Anyone surrounded only by people who agree with him quickly becomes dangerous to himself. Love is not permanent approval. It can be the ability to care enough about someone to set a limit before him. I believe our relationship was built on that as well.

We have gone through periods of considerable professional and personal intensity. Companies to build. Legal proceedings. Nights of work. The Abode of Chaos. Artprice. Travel. Battles. Our son, Sydney. Life’s accidents. None of that produces a picture-postcard couple. It produces something else.

An extremely deep knowledge of the other. After so many years, I know some of her reactions before she speaks. She probably recognizes some of my accelerations before I have fully formulated them myself. Yet that knowledge never abolishes mystery. Perhaps that is what allows a relationship to last. The other remains other.

I know her, and yet she continues to surprise me. It is this otherness that makes construction possible. Two copies would produce nothing comparable. I understand today that this difference already prepares the central subject of Part IV: transmission never consists in producing copies. Nadège is not my double. Sydney will be neither mine nor hers. A family is not a chain of intellectual reproduction. When it works, it can become a space in which several mental architectures learn to build together. That is exactly what gradually happened with us. Me, Nadège, then Sydney. Three ways of seeing. Three relationships to time. Three sensibilities. And yet a continuity. I believe this trilogy is one of the most important architectures in everything we have built.

Artprice cannot be understood without it. Neither can the Abode of Chaos. Groupe Serveur even less so. It does not mean we do everything together. It means that certain decisions, intuitions, and continuities are built within this triangular space in which each person remains himself or herself. Nadège is one of its essential vertices. Perhaps even the one that ensures the triangle does not come apart when the other forces pull in opposite directions.

When I look today at everything we have gone through, I could choose spectacular images. The acquisitions. The great battles. The technologies. The monumental works. The international encounters.

But when I think of Nadège, another image often comes to mind. She is standing in front of a mass of documents. Or in front of her screen. She classifies. She checks. She connects. She organizes. No one photographs that moment. No journalist considers it spectacular. Yet part of our history rests there. In that gesture, repeated thousands of times, of refusing to let an important piece of information disappear.

It is a form of fidelity. To our work. To the people who transmitted something to us. To those who will come after us. And perhaps also to the conception of humanism we have shared for so long: we are never the owners of knowledge. We are its temporary custodians. Our duty is to increase it when we can, protect it when we must, and then transmit it. Nadège has made that idea a daily practice.

That is why, if I had to define in one sentence what she has brought to my existence, I would not say that she helped me accomplish the impossible. That would still be insufficient.

I would say: Nadège gave the possible we invented together the ability to endure.

And when something endures long enough to be transmitted to those who come after you, it ceases to be merely an adventure. It begins to become history.

That was the history Sydney would receive. Not as an inheritance already sealed. As a living system within which he would have to find his own place.