The difference between independent and non-independent objects
Since the Investigation which follows mainly concerns relations of Parts, we start off with a wholly general discussion of such relations.
Objects can be related to one another as Wholes to Parts, they can also be related to one another as coordinated parts of a whole. These sorts of relations have an a priori foundation in the Idea of an object. Every object is either actually or possibly a part, i.e. there are actual or possible wholes that include it. Not every object, on the other hand, need perhaps have parts, and we have therefore the ideal division of objects into the simple and the complex.