  In fact, as this passage tells us, synthesis into an object by an act of recognition requires two things. One is memory. The other is that something in the past representations must be recognized as related to present ones. And to recognize that earlier and later representations are both representing a single object, we must use a concept, a rule (A121, A126). In fact, we must use a number of concepts: number, quality, modality, and, of course, the specific empirical concept of the object we are recognizing.