Vertical Prototyping

In one of your blogs, you define something like vertical prototype as a way like it was an answer for a question. What is the right strategy when it comes to going to production with a model? Can you elaborate a little bit more on it? Yeah, so when I wrote and also when I do conference talks and I speak about vertical prototypes, then what I'm referring to is a philosophy of how I believe, not in every case, but in many cases, you should approach building a model.