Earth has a population of 1b hominids. For the most part, they are happy with their lot, living in a preserve at the bottom of a gravity well. Those who are unhappy have emigrated, joining one or another of the swarming densethinker clades that fog the inner solar system with a dust of molecular machinery so thick that it obscures the sun. Except for the solitary lighthouse beam that perpetually tracks the Earth in its orbit, the system from outside resembles a spherical fogbank radiating in the infrared spectrum; a matrioshka brain, nested Dyson orbitals built from the dismantled bones of moons and planets.

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