 Although we are jumping ahead of our story, it is worth remarking here that the situation does not improve in the general theory of relativity, as Dieks notes in §3. It has been proposed that the mean motion of matter could be used to define a preferred frame that, in turn, could be foliated (or sliced) into spacelike hypersurfaces that define a preferred global time. But this procedure would work only at a large scale, wherein there would be an arbitrary element in both determining the scale and the averaging procedure. Should one retreat to the use of actual world lines, the rotation problem reasserts itself.