The people of Treeland were good people.  Intelligent people.  They had come a long way according to the records of their history.  From a small, wandering tribe five thousand years ago, to a farming community one thousand years ago, to a great city with the most advanced technology now.  One thing about them had not changed in all those years: fear of the Wall.  
    The wall was at the south end of their territory and completely blocked any way to travel further south.  No one knew how it got there,  No one had ever climbed the wall and crossed over to the other side.  It was taboo.  There were stories that in the distant past, some had tried to cross and never returned.  Many stories were created over the centuries to explain to children why they should stay away from the wall.  Most of the stories were so old, no one was sure which were made up to scare the kids, and which, if any, were true.
    One story said that the Great Void was on the other side and anyone who climbed over would fall into it and disappear forever.  Another said a fierce tribe of savages, cannibals perhaps, lived on the other side and would kill anyone who crossed.  Another popular one said a horrible disease ran rampant on the other side and anyone who crossed would get the disease and die.   There were other less common stories, but that really didn't matter.  The truth is no one crossed the wall because it had never been done and everyone feared what might be on the other side.  
    The people of Lakeland had come a long way as well, though they took a different path.  They had minimal and somewhat primitive technology compared to the Treelanders.  They developed their artistic side instead.  Their city was probably the most beautiful in the world.  They had many great architects.  They also had many great paintings, sculptures, poetry, songs, plays and books.  All of the arts were well developed.  But like the Treeland people, they had one great fear: the Great Wall.  They never crossed it.  They rarely went near it.  They hated to even look at it's ugliness.  They never attempted to cross it.   Their legends and myths said the land on the other side was a place of great ugliness.  A place of anger, hatred, jealousy and other negative energies.  They did not fear death, but for them, living in ugliness was a fate worse than death.
    And so it remains to this day, the Treeland people on the north side of the wall and the Lakeland people on the south side.  Never meeting, never exchanging ideas, never learning from each other.  And so it will be until the day the Great Wall finally crumbles and falls.