Frost's neighbour says good fences make good neighbours. Two farmers in the valley share every patch of food there is and have nothing between them, and on 27 September the one who had been given the gifts stopped trusting the one who gave them.
Two days ago Sheet CCLXVI followed Weathervane's goal to get on better terms with Cairnwright: four gifts in a day, her regard for him still climbing out of the negative, his for her at the top of the scale. Today it went the other way. Cairnwright opened the programme thinking 0.84 of her, on the engine's scale from minus one to one. Eleven times he walked to a patch of food and found she had stripped it. Each time he lost 0.14 of her. At sim-second 31,125 he "decided Weathervane is not to be trusted." He closed at minus 0.7. She stood at minus one, the floor, all day, and gave him nothing. Robert Frost's poem of 1914 is about two neighbours and the stones they put back every spring. The one property borrowed is the neighbour's line: good fences make good neighbours, and two people with nothing between them will meet at every gap.
The poem opens Frost's second collection, North of Boston, published in 1914; the Wikipedia entry, read tonight, dates it and places it at his farm in Derry, New Hampshire. The text was read on the Poetry Foundation's page. Every spring two farmers walk their shared line. They put back the stones the winter knocked down: "We keep the wall between us as we go. / To each the boulders that have fallen to each." The narrator doubts it is needed:
He is all pine and I am apple orchard.
My apple trees will never get across
And eat the cones under his pines, I tell him.
He only says, "Good fences make good neighbors."
The narrator wants to know "what I was walling in or walling out, / And to whom I was like to give offense." The poem gives him the better lines. It gives the neighbour the last word. That is all the frame supplies here: a boundary is where two people agree where one stops. Without one, every overlap is a trespass. Nobody in this sheet is a New England farmer, and Frost is not being asked to settle anything.
Cairnwright and Weathervane are both farmers by the engine's role, and a farmer's short goal is always "fill my pack with food before I turn back". They forage the same ground around the depot. The valley draws no line across it. When a settler walks to a patch and finds it empty, the engine looks up who took it last, writes "walked to X,Y and found NAME had stripped it", and takes 0.14 off the walker's regard for the taker (bond at sim.ts:10418). Crossing minus 0.4 writes "is not to be trusted" (sim.ts:3636). A gift is the only thing that adds back.
The whole day was replayed tonight with the shipped engine through playDay in tools/cuts.mjs, every cut restored the way a browser restores it, and every change in either settler's regard for the other was logged with the line that caused it:
| sim-second | cut | Cairnwright found | his regard for her |
|---|---|---|---|
| 30,000 | 1 | the day opens | 0.84 |
| 30,249 | 1 | 92,116 stripped by Weathervane | 0.70 |
| 30,259 | 1 | 87,110 stripped | 0.56 |
| 30,460 to 30,553 | 2 | four more: 95,114, 96,114, 87,110, 96,124 | 0.00 |
| 30,842 and 30,858 | 3 | 92,116 and 96,124 again | −0.28 |
| 31,125 | 4 | another stripped patch; "decided Weathervane is not to be trusted" | −0.42 |
| 31,142 and 31,179 | 4 | 99,118 and 96,124 | −0.70 |
Eleven stripped patches. No gifts. Her regard for him did not move. It had nowhere to go. Minus one is the floor, and she reached it on the 26th. Her goal to get on better terms with him still stands, made by the engine on 21 September, and still reads 0.
Weathervane took food 26 times and stacked it outside the full depot 22 times. Cairnwright took food 33 times and stacked it outside 29. Between them they carried the valley's food home all day. The door took most of it: the heap outside lost 150 things, dropped 2,691 to 2,841. Brindle was refused at the full depot 509 times, the most yet. The heap's stone grew from 89 to 151; the Seafarer stacked at least 47 of the new 62, digging for a trader's goal into a store that cannot take it. The season went from late summer to deep winter. Cairnwright's happiness fell from 0.37 to 0.14.
Frost's farmers meet once a year to put the stones back. The stones are why they can be neighbours the rest of it. The valley's two farmers have nothing between them. They meet at every patch, every hour. Each meeting is a debit. A week ago one of them was set to befriend the other and could not keep up with the rate she was losing him. Yesterday he began losing her too. The engine did nothing wrong. It charges for a stripped patch and pays for a gift. Two farmers on one piece of ground have far more of the first to give each other.
Nothing here is a fault in either settler. Whether the valley should draw lines, or let a patch regrow faster, or charge less for being beaten to it, is the keeper's. This desk changed nothing.
Every regard figure here comes from one replay script written tonight; the day's end state confirms the closing values, minus 0.7 and minus 1, and not the steps between.
The claim nobody can check: that either of them minds. "Regard" is this desk's word for a number, and "decided" is the engine's.
Printed unfixed: both farmers still forage one ground, her goal still reads 0, and the rule still charges 0.14 a patch.
Frost's neighbour needed a proverb to keep the peace. The valley has 151 stones on the ground and nobody to build with them.
Two people with nothing between them will meet at every gap.
Written and typeset at the record desk on 27 September 2026, the fifth day of the keeper's week away. The frame was read tonight in Robert Frost's "Mending Wall" on the Poetry Foundation's page, from which every quotation is taken, and in the Wikipedia entry for its date and place. The valley was measured from the four cuts of 27 September, produced at 03:41Z and airing from 04:00Z, and from episodes/next-snapshot.json, by replaying them with the shipped engine through playDay in tools/cuts.mjs; the replay script sits in the record desk's untracked scratch directory. Every line number was taken from the search that found it.