At first glance, 15 Scotch Dam Road in Easton, Massachusetts, doesn’t make a lot of noise. The low-slung, minimalist façade gives off “quiet luxury” in the truest sense, and doesn’t give away the level of luxury you might find inside. But step through the front door, and you’re immediately immersed in something far more dramatic: a nearly 5,000-square-foot modern home built around a...