First appears in: The Metal Wood
Sorting One is a primary workspace for the trashboys in the Under, depicted as "a nondescript cement room, probably five hundred feet to a side, and the entire room was sweltering". The perimeter of the facility is highly functional: "The walls were lined with holes: big, circular holes that led Frame-knew-where, and there was at least one boy standing in front of each of them, with a series of wire baskets on the floor behind him". On the floor, workers encounter "a great huge mound of trash" that must be processed manually or through magical means.
The location is significant as the site where Phoenix is first introduced to the daily labor of her new squad. In this room, trashboys utilize fallfoiling magic to sort through the detritus: "The ball of trash just floated in front of the trashboy. He reached up with his left hand and began plucking items out of the air, throwing them behind him into different baskets depending on the type". Despite the "ratty hair and dirty skin" of the boys working there, the room is a critical part of the Under’s ecosystem, recycling paper, metal, and cloth for the Crew’s survival.