 In short, and perhaps oversimplifying to a certain extent, we can say that in the Leibnizian realm of mind there are indeed only perceptions and appetitions, but in these there is a fundamental divide between the realm of consciousness and unconsciousness. In the former, there are apperceptions and desires, the perceptions and appetitions of which we are conscious. In the latter, there are perceptions and appetitions of which we are not conscious. That does not mean, however, that this latter realm is unimportant in our mental lives. As Leibniz says, “insensible perceptions are as important to [the science of minds, souls, and soul-like substances] as insensible corpuscles are to natural science, and it is just as unreasonable to reject the one as the other on the pretext that they are beyond the reach of our senses” (New Essays, Preface; RB 56). He would have said the same, no doubt, about inapperceptible appetitions.