Did you ever play with Legos? Besides being one of the most painful things to step on in the middle of the night, they are an amazing toy for explorative play.
If you’ve played with them, or seen them in stores, you know that there are general kits, and the kits for building pre-defined models.
That’s similar to how our success models are formed. Some are pre-defined, and we just follow the instructions to put them together to match the picture on the box. Others are free-form, and of our own design.