As for the answer to this-I've no idea. I'm not a stonemason. If you are one, feel free to tell me what makes the difference.What separates the apprentice stonemason, from a master stonemason.
All of us are putting in comparisons and analogies though, and I'm being reminded of my issue with those things to begin with.
Analogy is a great teaching school, because it compares to something you already know, and/or simplifies something. It's a much worse discussion/debate tool, as analogies in general are simplified and lack the complexity of the primary issue. That's what makes them great for teaching, but also what makes them problematic for debating. You can see this just reading along some of the 10 pages of debates on this forum, where the last five pages is people arguing about an analogy, rather than the issue itself.
I'm guilty of that myself a ton.