I don't think this is going to become a 'finished project' any time soon. My guess is that you're free to make something that appeals to you either:

1. Self contained in your region.

2. A logical extension of any other region so long as it doesn't require a change to what has already been written.

ie. don't expect features of your region to determine the condition of other regions - a culture might think its all alone but the next writer could create another cell elsewhere.


sigurd