The Planetary Compendium is an evolving archive of case studies that map the shifting architectures, imaginaries, and experiments shaping how life on Earth may be organised, sustained, and represented. Each case is a window into the planetary infrastructures and conditions that shape our collective future: from lunar governance and rights of nature to the ethics of geoengineering, transboundary risk mitigation, and interspecies communication. Together, the Berggruen Institute and Dark Matter Labs trace the slow emergence of a planetary civics, an unfinished language for governing a living planet that is fully embedded, incorporates the more-than-human, and remains ethically conscious of our entanglements.