Wikipedia lists the world's 23 separation barriers in a database (shown partially here) classifying them by country, dates, length, type.
How much better to view this data globally - revealing at a glance that only two (and one is only proposed) of the current world separation barriers are in the southern hemisphere.
And, of course, digitally:
Integrating geospatial, as well as political data in a "whole earth" social visualization would result in an instrument to view the obstructions to our human circulation – a Diasporarium.
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