I’m always fumbling with the A/C controls in my car. My daily commute is in hot, sunny Southern California, home of the courteous freeway driver. I can’t afford to take my eyes off the road for too long to find the control I’m looking for. Half of the time when I'm trying to adjust the temperature, I end up blowing my beard off because I’ve spun the wrong dial. If my wife’s in the car with me, I usually resort to asking her to do it for me. There’s a simple design principle that, had it bee...