The barbed-wire fence is a physical separation between Bruno and Shmuel. What other types of separation does the fence represent in this story?

The
fence could also said to represent the separation between truth and fantasy. Those on one side
of the fence, such as Bruno and his family, live in a Nazified fantasy world in which the heroic
master-race is superior to all other races and therefore has the right to do as it pleases.
According to the warped Nazi world-view, concentration camps are part of a bold, radical policy
that will ensure the future strength and security of the German people. It is this fanatical
ideology by which Bruno's father lives, and by which, if necessary, he is prepared to
die.

On the other side of the fence, the sordid realities of the Nazi Empire
are there for all to see. There's nothing noble or heroic about the gigantic program of genocide
being carried out by the Germans. This is mass murder, pure and simple. And yet the Germans,
still stuck in their deranged fantasy world, are not prepared to face up to this sickening
reality. They think they're acting as benefactors of humankind in destroying a...