Revolution recovery’s three-and-a-half-acre lot on Milnor Street in Northeast Philadelphia is a shrine to waste. The space hosts a huge pile of used wood and another of drywall. There are stacks of ceiling tiles and bundles of miscellaneous plastic and cardboard. The back of a truck is filled with rolled-up carpets and a group of boxes hold discarded metal poles. A truck pulls up and adds a load of mixed materials—wood, plastic, concrete and metal—to the mess. It’s like being inside a gigantic, well-organized construction site Dumpster.