  Phenomenological arrows of time can be traced to a past low-entropy state.
Does this imply the universe was in an improbable state in the past? I suggest
a different possibility: past low-entropy depends on the coarse-graining
implicit in our definition of entropy. This, in turn depends on our physical
coupling to the rest of the world. I conjecture that $any$ generic motion of a
sufficiently rich system satisfies the second law of thermodynamics, in either
direction of time, for $some$ choice of macroscopic observables. The low
entropy of the past could then be due to the way we couple to the universe (a
way needed for us doing what we do), hence to our natural macroscopic
variables, rather than to a strange past microstate of the world at large.
