Exterior, House, Cabin, Shingles, Wood, Gable, A-Frame, Prefab, Glass, and Mid-Century 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 Exterior Prefab Mid-Century Photos from Jens Risom's Block Island Family Retreat