  The paper discusses from a metaphysical standpoint the nature of the
dependence relation underpinning the talk of mutual action between material and
spatiotemporal structures in general relativity. It is shown that the standard
analyses of dependence in terms of causation or grounding are ill-suited for
the general relativistic context. Instead, a non-standard analytical framework
in terms of structural equation modeling is exploited, which leads to the
conclusion that the kind of dependence encoded in the Einstein field equations
is a novel one.
