When William Pedersen, FAIA, cofounder and principal design partner of Kohn Pedersen Fox, bought a 3-acre piece of waterfront land on Shelter Island, New York, in 1981, “Things were a little different on the island,” he wryly recalls. In the intervening years, the island has grown more expensive to live on and crowded with visitors during the summer, but Pedersen has created a residence that, nested in the earth and angled to create uninterrupted views of Long Island Sound, is protected from those changes.