My grandmother darned socks over a dead lightbulb. She kept it in the drawer of her sewing table, a pear-shaped bulb with a blackened filament, and in the evenings she would push it down into the heel of a sock until the worn place stretched pale and tight over the glass, like skin over a knuckle. Then she would thread a needle with wool that never quite matched and begin—not at the hole, but some distance from it. “You start in the good wool,” she told me, the one time I thought to ask. “You never start at the hole.”

I was nine, and I thought it was a rule about socks. It has taken me most of my adult life, and a good part of this year, to understand that it was a rule about almost everything. A hole cannot be mended from inside itself. You anchor the repair in what is still sound, carry your threads across the gap, and weave back and forth until the gap is no longer a gap but a stiff, slightly lumpy square that will, if you have done it well, outlast the rest of the sock. Hers did. I still have a pair she mended in the last winter of her life: the heels are perfect, and the toes have gone. The lightbulb is in my desk drawer. It is, I realize now, the only object in her house that failed at the job it was made for and was given another, which it did faithfully for 40 years.

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