Warnings cut short his playing. Someone had arrived at his entry hall. The scanners there assured him that the visitor, a woman, bore only harmless Mechanist implants: plaque-scraping arterial microbots, old-fashioned teflon kneecaps, plastic knuckles, a porous drug duct in the crook of the left elbow. Much of her hair was artificial, implanted strands of shining optical fibers.