Exterior, House Building Type, Cabin Building Type, Shingles Roof Material, Wood Siding Material, Gable RoofLine, A-Frame RoofLine, Prefab Building Type, Glass Siding Material, and Mid-Century Building Type Mid-century designer Jens Risom's A-framed prefab family retreat, located on the northern portion of Block island, is bordered by a low stone wall, an aesthetic element that appears throughout the land.   Best Photos from Jens Risom's Block Island Family Retreat