As we have seen, representations never appear singly, but continuously interact, complicating and fusing with or inhibiting each other. They form sequences and series, which, in turn, get interwoven with each other, forming stable groupings called representational masses. Simply put, “apperception” is Herbart’s term for the assimilation of one representation or representational mass into another. In this section I will explain not only the mechanism of this process, but also why Herbart calls it “apperception”.[65]