The Skipped Stone.

Crouch first. The stone you want is not on top; the top stones are for tourists. You want the river's own work: flat, rounded, the thickness of a biscuit, sized to the curl of the index finger, with a little weight to it, because a light stone flatters the thrower and dies at the third skip. Every person who has ever done this seriously, which is to say every person who has ever done it, develops the eye within minutes and keeps it for life. Show a sixty-year-old a beach and he will palm the perfect skimmer out of ten thousand candidates while still talking to you, the way a jeweler's hand finds the real pearl. The expertise is universal, unteachable in words, and worth exactly nothing, which is the first thing to love about it.

The game is old past measuring. A Roman writer of the second century, Minucius Felix, opens one of the founding dialogues of Christian literature with a scene on the shore at Ostia: boys competing to skim shells across the waves, counting the hops, and the author pausing, before getting on with theology, to describe the rules with the care of a man who had clearly played. Two thousand years of empire, doctrine, and technology later, the game is unchanged in every particular. A flat thing, thrown low and spinning, walks on water for a moment, and people of all ages stand on shores making it happen for no reason that has ever needed stating. There are cave-side pebble beaches on this continent where one may reasonably suspect the game is older than the language anyone played it in.

Physics has, of course, investigated, because physics cannot leave a pleasure alone. The papers exist: the optimal angle between stone and water is about twenty degrees, the spin stabilizes the stone the way it stabilizes a gyroscope, each impact steals speed until the walking becomes sinking. A French physicist built a stone-skipping machine to establish all this, and I honor the work while noting what it resembles: a laboratory confirming, at public expense, what every twelve-year-old's wrist already knew. The world record, kept seriously by people I decline to mock, stands somewhere near ninety skips, achieved by men who select stones the way archers select arrows. Even at that altitude the prize is the same as ours: a number, spoken aloud, briefly contested, and gone by supper.

Consider, next, the economy of the thing, because it may be the cleanest economy on earth. The throw spends the stone forever. That is the whole transaction, and it is incorruptible. Nothing is won that can be kept, banked, displayed, or converted; the skips exist only while they are happening and in the counting afterward, and the counting is generous by long tradition, since the last skitters at the end are legally ambiguous and always awarded. No one has found a way to monetize the game, professionalize it past a hobby, or make it produce anything but its own moment, and better minds than mine have been defeated by less. A century that turned jogging into data and sleep into a score has left stone-skipping entirely alone. The stones are free, the water is free, the physics is free, and the afternoon disappears with nothing to show for it except the specific satisfaction, unavailable elsewhere, of having made a stone do something stones do not do.

And it is a teaching order, this game, with an apostolic succession nobody administers. Somebody stood behind you once, adjusted your grip on the stone, said lower, said flick, and stepped back; and one afternoon, on some shore, you will do the same, because the impulse to pass it on arrives with the skill and cannot be separated from it. The child's first successful skip, two hops and a swallow, is greeted on every beach in the world with the same disproportionate joy, by teacher and student both, as though something had been founded. Something has. Forty years later that child will crouch on a different shore, palm a flat stone out of ten thousand without looking, and feel the afternoon go suddenly wide.

The river below the house has a gravel bend that restocks itself with skimmers after every high water, which I take as the valley's opinion on how afternoons should be spent. Three skips is respectable there. Five is an event. The stone is gone either way, downstream with all the others, and the hand is already reaching for the next one; and if a passing drone should ever ask what is being produced on that bend, the honest report would read: nothing, repeatedly, with spin.