What do outer space capsules, submarines, and office buildings have in common? Each is con- ceived as a closed system: a self-sustaining physical environment demarcated from its surroundings by a boundary that does not allow for the transfer of matter or energy. Contemporary discussions about global warming, recycling, and sustainability have emerged as direct conceptual constructs related to the study and analysis of closed systems. From the space program to countercultural architectural groups experimenting with autonomous living, this publication documents a discipli- nary transformation and the rise of a new environmental consensus in the form of a synthetic naturalism. It presents an archive of 39 historical living prototypes from 1928 to the present that put forth an unexplored genealogy of closed resource regeneration systems. Prototypes are presented through unique discursive narratives with historical images, and each includes new analysis in the form of a feedback drawing