I really appreciate the analogy. As an ex-physicist, I was always interested in numbers and the way we approach them. There are "numbers in calculation" where

I really appreciate the analogy. As an ex-physicist, I was always interested in numbers and the way we approach them. There are "numbers in calculation" where one writes 10^12 and this is just a part of an equation, you do not relate to it at all. And then there is 1, 2, maybe to 15 that you feel instinctively (you can estimate the number quite well), then it goes worse for 50, 100, 200, 500, 1000, 10000 where you usually have no idea if you are not used to a reference (say, you are a teacher and you know that your room is 200 people - there is a chance you can estimate that number when you see people outside that room). Millions and whatnot are just an abstract concept. So your analogy with bricks and cities is on spot. Thanks!