The land around Thornapple Township was shaped by ice — kettle holes, gravel ridges, the long rolls of ground that make the Yankee Springs country such odd, beautiful mowing. Terrain Transformers takes it as it comes: mowing, edging and seasonal cleanups on those slopes through the green months, then plowing and shoveling once they go white. A hillside lawn cut evenly, without scalping the crest, is a small piece of craftsmanship. So is a curving drive opened end to end at first light while the woods are still blue. Both ask the same thing of you — know the ground before you touch it.