Saturday morning on Littleton's Main Street, the brick fronts throw their shadows halfway across the pavement and the town wakes up slowly, the way old downtowns do. A few blocks off that stretch, Pro Tech Lawn Services is already at work: engine running, deck set, the first stripe going down the length of a front yard. Mowing, edging, trimming and cleanups are the whole of it, repeated with the kind of care that shows up mostly in the details — a line along the drive with no ragged fringe, a strip under the mailbox cut as short as the rest. Littleton's summers are hot and the sun sits high and hard here, so a lawn that stays even and clean takes steady visits rather than heroics. Coming back to a finished yard at the end of a morning is a plain and lasting satisfaction.