I woke early, suffocated by a sweaty and prickling sense of apprehension—exactly the feeling of wool against the skin on a warm day. Yet there, in the dark of my bedroom, the sun seemed impossibly far away. What had set this fear in my veins? None of my current design projects were so difficult or important. I was using a new half-micron twill for a suit, but I had tested the fabric extensively and knew its properties. And though the motor-driven ball gown we were creating was complicated, my assistant and I had spent a whole day installing the mechanics and testing it again and again. No, those projects were essentially complete, and I felt good about their look, materials, and function.