The process of outer apperception provides the model for inner apperception (SW VI: 141). Simply replace the sensa \(W, w,\ldots\) with a relatively weak representational series \(m, n, o, \boldsymbol{p}, q, \ldots\) already present in (as opposed to newly entering) the soul. If now there is in consciousness at the same time a second “stable and powerful mass”, \(P, \mathrm{P}, \boldsymbol{p}, \pi, \ldots\), the two series will complicate with or “fold into” each other, generating some new complex (such as \(Pm\) or \(Pn\)) that has elements from each series (Stout 1888b: 485). Now from each member of the new complex, two chains of reproduction will evolve, e.g., in the case of \(Pm\), one from \(P\), and another from \(m\). Each of these two chains strives to unfold itself according to its own law. But because both series contain the common member \(\boldsymbol{p}\), the evolving chains must fuse at this node and so reinforce each other. As in the case of outer apperception, the m-series is initially more vivacious and depresses the P-series. As they interact, the greater strength and coherence of the P-series reacts, “[re-]form[ing] the [weaker m-series] in its own image”: the stronger mass preserves the similar elements in the weaker by fusing with it, while driving it back at other, dissimilar points (SW VI: 144). From the point at which the two chains are fused at \(\boldsymbol{p}\), their respective reproductions cannot continue, as they would have separately. Instead, they now become interwoven into a new representational mass with “a new total-force” (SW VI: 141).