> the idea of a city split into two
We see this more often than not. The modern version just omit the walls
https://www.nytimes.com/interactive/2021/upshot/2020-electio...
> physical barrier could affect the spread of information Don't you think that there is a component of physical barrier in today's internet? while this may sound odd for the Americans, this is very typical in many parts of the world (East Europe, Asia and parts of Africa and Latin America)