One of the most evident features of the human past is the growing scale of connections between areas, shown for instance by the movement of materials (such as the Obsidian Trade). Although the current phase of "globalisation" is unique in its range and impact, it was preceded by many earlier episodes of expansion and collapse. These maps reconstruct how such networks develop, and show how they follow a logic reflecting both their own geometry and that of the Earth's surface, and how they sometimes come to a catastrophic stop.