There was a wall.
so begins The Dispossessed, Ursula K. LeGuin‘s utopian/dystopian novel. the wall is not much as far as walls go – no Berlin Wall here. it is simply the wall enclosing the (mostly unused) spaceport in Anarres, the moon of Urras; Anarres was settled almost two hundred years ago by revolutionaries from Urras.
the revolutionaries have made Anarres into an anarchists’ paradise: there is no private property, no government per se; but an anarchist society can become as rigid as other societies, which drives the physicist Shevek to leave Anarres for Urras.