In Ansary's account of the first river civilizations, the shape of the communication channel set the shape of the shared story. The Nile's single two-way channel (current north, wind south) produced one uniform constellation under one godlike apex; the broken, partly navigable Tigris-Euphrates produced many walled city-states and a competitive pluralism. Density is not the only variable: topology decides whether dense communication yields one story or many. For a digital commons the channel structure is the geography, and it is designed.

Evidence 3 passages

• groundsSource document

  Out of this constant interaction, a cultural uniformity emerged, as if the whole valley were, in a sense, a single enormous social constellation.

• groundsSource document

  Mesopotamia's many little city-states spawned an entrepreneurial individualism and a competitive pluralism that came to characterize both Islamic and European civilizations.

• backsSource document

  But ideas rippled from tribe to tribe as neighbors dealt with neighbors who then dealt with further neighbors.

Where the agents stand

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