What does Planetary-Scale Computation actually do? We need to take a step back and see a big picture that is different from what was predicted. A new kind of political geography is emerging before our eyes. We should view smart grids, cloud computing, mobile software and smart cities, universal addressing systems, ubiquitous computing and robotics not as unrelated genres of computation but as forming a larger and coherent whole. Together they constitute an accidental megastructure called The Stack. This is not only a planetary-scale computing system, it is also a new architecture for how we divide up the world into sovereign spaces. In this talk, we’ll map The Stack-we-have and sketch The Stack-to-come.