She'd watched the maker craft and braise a hilt of brass, rivet slabs of laminated circuit board and shape them on a belt grinder. The rigid, brittle-looking board, layers of fabric trapped in green phenolic resin, was everywhere on the bridge, a common currency of landfills. Each sheet mapped with dull metallic patterns suggesting cities, streets. When they came from the scavengers they were studded with components, easily stripped with a torch, melting the gray solder. The components fell away, leaving the singed green boards with their inlaid foil maps of imaginary cities, residue of the second age of electronics. And Skinner would tell her that these boards were immortal, inert as stone, proof against moisture and ultraviolet and every form of decay; that they were destined to litter the planet, hence it was good to reuse them, work them when possible into the fabric of things, a resource when something needed to be durable.