Good design makes complicated things simple. Great design does it while inspiring us. Think of the first time you spun an iPod thumb wheel and realized you wouldn’t need instructions to figure this thing out. Or the first time you looked at a Prius’s mileage screen and understood how easing off the gas at green lights would boost your mileage — again, without instructions. These experiences stop us in our tracks with the realization there are smart people out there using their powers for good.