This, as I see it, is the thesis of reductionism. Reductionism is not a positive belief, but rather, a disbelief that the higher levels of simplified multilevel models are out there in the territory.
The higher levels could have been, though. The fact that we have high-level abstractions in our heads does not by itself mean that there is nothing corresponding to them in the territory. (To make that argument is a version the fallacy that since there is a form of probability in the map, there can be none in the territory).
The higher levels could have been, though. The fact that we have high-level abstractions in our heads does not by itself mean that there is nothing corresponding to them in the territory. (To make that argument is a version the fallacy that since there is a form of probability in the map, there can be none in the territory).