Hi.
I was at first a little perplex to see physical frontiers move with culture. In real world, a frontier doesn't move til there's a revolution or something. So I will try to definite what are boundaries in Civ III for two reasons:
-I find it fun
-I think it is too vague by now
So I'd first say that boundaries, in Civ III, ARE physical boundaries, despite the cultural aspect of it.
Secondly, the cultural aspect of it do not mean in fact that you take more physical space when you have a stronger culture, but that your culture stronger further of your main cities, meaning that populations on boundaries may want to join you. If there isn't any city, it is then because there are instead little villages and inhabitants that are peripheral to other cities and too little to be considered independently as cities in Civ III.
If anyone would like to make any comment, add some stuff or else, I'll be happy to see what I could have put wrong. I dunno if anyone else likes theory as such but I guess maybe a few
