Question

The ink on the vellum was slow to dry, pooling in the depressions where Julian’s hand had trembled. Before him lay the third draft of the municipal survey of Oakhaven, dated 1904—a fiction of precision, for the river had already claimed the western wharf three winters prior. In the silence of the study, the scratching of his quill seemed to drag the past forward, or perhaps it was he who was drifting backward into the mud of that November night.

He could still smell the river silt. It had coated Clara’s boots as they stood on the levee, watching the black water rise toward the lanterns. "A map is only a ledger of losses," she had remarked then, her voice flat against the roar of the current. Julian had laughed, a sharp, dismissive sound that now echoed in his ears with the weight of an unpayable debt. He had believed in the permanence of stone, in the mathematical stability of the grid he had spent his youth drawing. He had not understood that the river, in its sudden, violent resequencing of the landscape, was the only true cartographer.

Now, his pen traced the contours of the old canal path, a line he knew by heart but could no longer find under the silt of the present. The clock on the mantel chimed twice, its steady, mechanical progression a stark contrast to the fluid, overlapping eras in his mind. In the ledger of his memory, Clara was still speaking, her words interrupting the quiet of his seventy-first year. He recalled the morning after the flood: the sun breaking through grey clouds to illuminate a valley transformed into a lake of glass, beneath which the chimney tops of their neighbors’ homes stood like drowned sentinels. He had tried to draw it then, but the paper had turned to mush in his damp fingers.

"You are drawing what was, not what is," the inspector had warned him a week later, rejecting the official survey. But for Julian, the distinction had ceased to exist. To map the city was to map Clara’s absence, to record the exact coordinates where the earth had yielded and his sister had slipped into the torrent. The chronology of his life had fractured; the sixty years since the flood did not lie end-to-end like rulers, but piled one upon the other, transparent plates of glass through which he viewed a single, unchanging moment of devastation. He dipped the quill once more, the black ink spreading across the paper like the rising water.

In the passage, the narrator’s transition from detailing the technical aspects of cartography in his study to recalling the flood of his youth primarily serves to do which of the following?