Irving Harper: Harper’s Rye, New York, farmhouse is filled with vintage Herman Miller, and no wonder: As a designer in George Nelson’s office, Harper was the vision behind classics like the Marshmallow Sofa. Even more fascinating for Williamson were Harper’s paper sculptures (pictured), which filled both the house and a massive barn out back. Made from everyday materials like toothpicks, pins, and straws, they were Harper’s main creative outlet post-retirement. “It kept me sane,” he says.