There’s a breezy transparency and restless shifting of planes, especially on the upper levels of this 12,000-square-foot house. Glass curtain walls on both the north and south facades are made of six-foot-wide panels of hurricane-resistant glass, as if the outer membrane had been peeled back to create a sense of spectacle by revealing all interior spaces. But the spatial heart of the master plan is a staircase that rises from the ground floor like the chambers of a nautilus shell. On the third level, internal spaces expand laterally toward the Atlantic on one side and a fresh-water lake on the other. The master bedroom suite is a boxlike entity framed with teak that bulges to the east like a Persian balcony. The western end of the house features an open-faced framework with a sky deck and transparent swimming pool, a high-concept fishbowl made from mirrored glass with a large, transparent “window” facing west that makes for surreal moments of surprise when someone swims past the transparent opening and appears suspended in aqua-blue space. “We wanted the water of the pool to appear solid, as if you were swimming through the room,” said Coy. “It’s a Dr. No moment.”

“I wanted the water to appear solid, as if you were swimming through the room.