We take energy for granted. We know it’s there, someplace. Water is running, lights are on, food is cooking, and something somewhere is making it happen. But we can’t see it, like a new couch or a new car, we can’t flop onto it, jump into it, speed it up. It’s one thing to try to sell people something tactile and visible, it’s another to sell them an idea for something that is invisible and seems intangible.