 In the face of these objections, limited pancomputationalists are likely to maintain that the explanatory force of computational explanations does not come from the claim that a system is computational simpliciter. Rather, explanatory force comes from the specific computations that a system is said to perform. Thus, while a rock and a digital computer both perform computations, the fact that they perform radically different computations explains the difference between them. As to the objection that there are still too many computations performed by each system, limited pancomputationalists have two main options: either to bite the bullet and accept that every system implements indefinitely many computations, or to find a way to single out, among the many computational descriptions satisfied by each system, the one that is ontologically privileged—the one that captures the computation performed by the system. One way to do this is to postulate a fundamental physical level, whose most accurate computational description identifies the (most fundamental) computation performed by the system. This response is built into the view that the physical world is fundamentally computational (explored in the next section).