 But this can’t be enough to say. We don’t really have any idea of what the intrinsic properties of fusions are because the axioms of mereology are silent about the intrinsic characters of fusions. So we don’t really have any idea of whether the distance relations of their parts supervene upon their properties. Perhaps fusions don’t have much, if any, intrinsic character! Since we don’t know much about these things, we’re not in a position to rule out the possibility of a duplicate of Lewis’s proton-electron fusion being a fusion that has parts which are a different distance apart than the original proton and electron Lewis described.