Yada Yada Over the Best Part

In the factories, it's really the factory that knows how to put these objects together. But in the builder, it's when you don't really know what you want that object to look like. And so you need the calling code to actually put that together. The best part is coming up. We're talking about singletons. It could be more than one or two levels, right? So I've heard stories. All right. Next up is builders yada yada over the best part.