This Long Island cottage is a slice of architectural heaven. The small guest house, which overlooks the Long Island Sound and Thimble Islands, was designed by Gray Organschi Archictecture, who were sure to optimize the visual and environmental qualities of the area, and incorporate renewable materials and energy sources. It features a combined living and dining room, with a hidden kitchenette, single bedroom and bathroom, and additional loft space. The cottage is heated and cooled by a ground source heat pump, with its geothermal wells lying beneath the building. Glazing details dematerialize the building’s seams: eaves come apart from the walls, corners detach, the roof tears open to connect the light-filled interior to the expanse and beauty of the site. With long view, branching canopies of oaks, and the ever-changing coastal sky, I can’t imagine a more peaceful and serene weekend escape.