 One problem with this suggestion has to do with how we are to understand the “intrinsic” but (allegedly) “non-causal” features in virtue of which the movements of the continental plates “resemble” the artificial models which the seismologists are able to manipulate. It is well-known that small scale models and simulations of naturally occurring phenomena that superficially resemble or mimic those phenomena may nonetheless fail to capture their causally relevant features because, for example, the models fail to “scale up”—because causal processes that are not represented in the model become quite important at the length scales that characterize the naturally occurring phenomena. Thus, when we ask what it is for a model or simulation which contains manipulable causes to “resemble” phenomena involving unmanipulable causes, the relevant notion of resemblance seems to require that the same causal processes are operative in both. Menzies and Price do not provide any reason to think that this notion of resemblance can be characterized in non-causal terms. But if the extension of their account to unmanipulable causes requires a notion of resemblance that is already causal in character and which, ex hypothesi cannot be explained in terms of our experience of agency, then their reduction fails.