The old racetrack oval at the Downs is still legible in the way that end of Scarborough lies, a long curve of open ground under a wide sky. Maine Turf & Greenery Inc works in that spirit: turf cut at the right height, trimmed clean at every obstacle, tended often enough that it thickens instead of thinning. Spring is when the difference announces itself, the green arriving all at once and all one shade. Winter sends the same crew out behind plows, opening driveways and commercial lots before the morning starts moving. Scarborough anchors the map, with Saco, South Portland and the Portland edge inside the loop.