That&#x27;s a very unappealing title for a very interesting subject, which is that there are complexity barriers that get in the way of creating larger programs.<p>For the sake of illustration, he says a novice may hit a brick wall at 2,000 lines of code, and be unable to add features after that without breaking things.<p>The next level for a more experienced programmer might be 20,000 lines of code, and he describes some things that helped him get there.<p>Then there&#x27;s his personal breakthrough to 200,000 lines of code. etc.<p>(I add this gloss to spur people to read the piece, which is interesting, and add their own ideas, not because I am claiming the above is some kind of absolute truth.)