Professor Thorne did not walk; he glided through the stacks of the university library like a predator made of parchment and ink. He was the kind of man who could tell you the exact temperature of the Nile during the reign of Ramses II without checking a book, and who looked at a modern textbook on history with a pity that was almost palpable.

I was a junior in the History department, a boy who thought he knew the world because he had read a few monographs. Thorne took me on as his research assistant, and within a month, my entire understanding of reality had been dismantled.

"The problem with your generation, Leo," he told me one afternoon, his voice a dry rasp that sounded like wind through dead leaves, "is that you believe the past is a series of dates. The past is not a timeline; it is a layer of sediment. We are all just walking on the ruins of our former selves."

He never spoke of his own past. There were no photos of a family, no mentions of a hometown. He lived in a small apartment filled with books that weren't listed in any catalog and instruments that looked like they belonged in an alchemist's lab.

I began to notice the anomalies. I saw him in a photograph from 1924, standing in the background of a street scene in Paris, wearing the same expression of profound boredom he wore in our seminars. I found a letter in the archives from the 18th century, signed with his exact, idiosyncratic flourish.

I tried to confront him once. "Professor, how is it that you appear in records from a hundred years ago?"

He didn't look up from his manuscript. "The eye sees what the mind is prepared to comprehend, Leo. You are seeing a pattern. Patterns are the only things that survive the erosion of time."

As the semester progressed, I felt a terrifying attraction to his void. He taught me languages that were dead to the world but alive in his throat. He showed me how to read the silence between the lines of a treaty. But the more I learned, the more I felt my own life shrinking. Beside him, my ambitions seemed like the play-acting of a child.

One night, I found him standing on the roof of the library, looking out over the city lights of New York. He looked ancient, not in his skin, but in his posture—a weariness that spanned epochs.

"Do you ever get tired, Professor?" I asked.

He looked at me, and for a second, I saw a flicker of genuine grief in his eyes. "Every single second, Leo. Every single second."

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