Have you ever built a stool? The reality for most of us is no. Long gone are the days of mandatory shop class in high school. So, do me a favor, and visualize this mentally. You're building a stool. You've got one leg on, you've just fiddled the second one in, and you're preparing to add the last leg. Seems simple enough, right? Now add the fact that you're doing this on a train going 100 miles an hour. Not so easy anymore. And, frankly, a little insane.