I was in New York last week, and stopped to have coffee with a friend in the afternoon. He had a meeting to get to, and I wanted to catch a 4:00 train home to Philadelphia. I was sitting on a low bench, leaning forward, elbows on my knees. It got to 3:00 or so, and I started glancing at my watch every few minutes. But it was always off, because my wrist was already positioned with the watch face up. The only way I could check the time was to artificially flick my wrist or to use my right hand to tap the screen — in either case, a far heavier gesture than the mere glance I’d have needed with my regular watch.