  Copernicus realised we were not at the centre of the universe. A universe
made finite by topological identifications introduces a new Copernican
consideration: while we may not be at the geometric centre of the universe,
some galaxy could be. A finite universe also picks out a preferred frame: the
frame in which the universe is smallest. Although we are not likely to be at
the centre of the universe, we must live in the preferred frame (if we are at
rest with respect to the cosmological expansion). We show that the preferred
topological frame must also be the comoving frame in a homogeneous and
isotropic cosmological spacetime. Some implications of topologically
identifying time are also discussed.
