The solar mirrors that BrightSource Energy is mounting on trackers in California’s Mojave Desert run 7.2 meters by 10.5 meters. That's hundreds of times larger than a new kind of tiny solar mirror that energy tinkerer Saul Griffith is working on, which stretches no bigger than 5 centimeters by 5 centimeters and is meant to sit on little tubular trackers that are no taller than a toothpick.
