Parallel Universes, think of the Oceans that separate Continents

The mind is agog when one contemplates

the possibility of travel 

between universes.

Yet as David Deutsch argues in 

The Beginning of Infinity once the barrier

of travel between Universes becomes

penetrable it is helpful to compare 

Universes to the oceans that separate our 

continents

To conceive of impenetrable separate 

Universes at best is anthropocentric, 

 (regarding humans as the central element of the universe)

and at worst, not just science fiction,

but plain fiction.