“It was all right when I did it,” I said, “but when you did it, it was wrong. As though—you were following a trail, but a tree had fallen down in the meantime, or some hedge grew up, and you insisted on continuing on anyway, instead of going around it—” “There are no hedges!” he roared. “It comes, I suppose,” I said thoughtfully, speaking to the air, “of spending too much time alone indoors, and forgetting that living things don’t always stay where you put them.”