After all, isn't a model intended to abstract away unnecessary detail so as to allow allow you to understand the system in a way that may not be clear at the implementation level?
The vision sign has something to do with basic feel form in all kinds of realms, it is not abstract, and also not empty, seems to always fill with living nicety and nice repining in the humanly feels.
At the top of the list is the notion that intelligence is measured by your ability to solve complex problems; to read, write and compute at certain levels; and to resolve abstract equations quickly.
This means that you can combine model elements of a given type into units that, in turn, you can use as the building blocks to be combined in the same way at the next level of abstraction, and so on.