We know the globe as a patched work of countries. We divert rivers to build towns, yet cling to a habit of geography. As we call suns stars, so we call cities foreign, turn to our own past and treat it the same way.
Some distances are measured in kilometres, in mountains, oceans, land. Some distances are measured in flight hours, stop-overs, and satellite lag. All measure spacebut what space?
We have fitted out the space of culture, we live it more than the physical. It is our humanity, it is our cities with no distance in between.
It is where the root of the present lies within the past, and so the past within the present. Then history is yesterday, or yesterday's yesterday, or some other number of yesterdays. We built them all.
What a place for city walls.