Matt Linderman at Signal vs. Noise cites Christopher Alexander – Christopher Alexander on the difference between a fifty-year-old carpenter and a novice:

"The difference between the novice and the master is simply that the novice has not learnt, yet, how to do things in such a way that he can afford to make small mistakes. The master knows that the sequence of his actions will always allow him to cover his mistakes a little further down the line. It is this simple but essential knowledge which gives the work of a master carpenter its wonderful, smooth, relaxed, and almost unconcerned simplicity."