I’ve been out in the woods along our yard with a tractor, 200 feet of steel rope, and a bag of rated hardware, building a longer, steeper zip line for the grandkids.

I checked the anchor trees again. Checked the rating of the cable again. I ratcheted out the slack, checked the drop, shooed eager kids away until I was sure. Or as sure as I could be.

I am, in other words, building risk on purpose, for people I love, who trust me completely, and I cannot stop doing the math.

Which is funny, because the math is not how I was raised.

Dyer, Indiana. Mid-1960s.

My uncle Jim always had a pickup. One summer day with the windows down, my older brother and I rode up front with him on the bench seat. There were no seatbelts anywhere on that bench — and nobody ever thought a thing about it.

Uncle Jim. The uncle whose fallen barn gave us the lumber for a treehouse. Our favorite uncle. One of the handful of people who taught me what a man could be — not with words; you watched how he lived, and you learned, the good and the bad both. On this particular day he taught me something he didn’t mean to.

He pulled off US 30 — the old Lincoln Highway — up a sloped drive to visit a friend. He left the truck at the top of the hill — a real one; the ground fell away behind us toward the highway, a road with somewhere to be. He turned it off and left it in gear, the way you did with a column shift. He left my brother and me on the bench. And he stepped off a few paces to talk.

I was five, maybe six. My brother a year older. I’d like to tell you exactly what happened next, but I can’t, because I don’t entirely know. Two boys alone in a truck cab — I assume we were horsing around. One of us knocked the column lever out of gear, and a long time ago I stopped trying to figure out who did what.

The truck began to roll backward down the hill.

A single memory remains, almost more real now than it was then. The truck rolling, the highway growing in the back window.

I have carried that image my whole life, clear as a photograph. I genuinely cannot tell you whether I saw it or built it later out of the retellings — the way you build a treehouse out of a barn that has already fallen down.

What I know is this. The windows were open. Uncle Jim had been standing just out of reach, and he made himself reach — covered ground he had no business covering, got an arm in through the window, and either hauled the lever back into gear or caught us early enough on the slope that he could. The truck stopped.

And then it was over, the way these things are over. No crash. No story for the papers. Two boys on a bench without a clue and a man with his heart pounding.

I don’t remember being afraid. I remember the truck moving, and then not moving. We might have stopped for ice cream on the way home.

One thing I’m sure of, though. He didn’t tell Aunt Irene.

Sixty years on, I’m in the woods with a wrench, and I think about that truck more than you’d guess.

Here’s what I’ve worked out. The danger was never Uncle Jim. Kids rode the front bench. Kids got left in trucks. He was a good man doing exactly what every good man around him did — and the margin between an ordinary errand and a terrible phone call turned out to be a few feet of gravel and how fast he could move. That is all it ever is. A few feet, and whether the adult is paying attention.

I can’t give my grandchildren the childhood I had — no belts, no working-load charts, an uncle who trusted a hill not to be a hill. Some days I’m not sure I’d give it to them if I could. Other days I’m not sure I wouldn’t. That childhood is the one still throwing me photograph-clear images. It is the one worth remembering.

So I build the zip line. I check the anchor trees twice. I ride the line myself. I’m the one outside the truck now — and I’m trying to be the kind of man who never has to make himself reach.

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