SO NOW IT’S THE CRUST, the skin, the rind: There’s a new metaphor for the object of ecology, a new slogan for a new epistemology, a successor to the “blue marble,” “Whole Earth,” “Spaceship Earth,” Gaia, the Anthropocene, and all the rest. “Critical Zones: Observatories for Earthly Politics” is the title of the show that Bruno Latour, a dependable coiner of epistemological metaphors and neologisms, and Peter Weibel, acting as usual as the pandisciplinary authority on all fields and topics, organized for the