THE SPACE WAS windowless. Or, if you were willing to consider giant flat-panel screens as being windows into other worlds, it was a greenhouse. In the middle was Devin’s elliptical trainer, or rather one of a pool of treadmills, elliptical trainers, and other such gadgets that were swapped in and out as he ruined or got sick of them. Depending from the ceiling was a massive articulated structure: an industrial robot arm, capable of being programmed to move along and rotate around a myriad of axes with the silence of a panther and the precision of a knife fighter. It supported an additional large flat-panel screen and a framework that held up an array of input devices: an ergonomic keyboard, trackballs, and other devices of which Richard knew not the names. Devin, naked except for a pair of gym shorts emblazoned with the logo of one of his favorite charities, was stirring the air with his legs, working the reciprocating paddles of the trainer. Invisible streams of cool wind impinged on his body from perfectly silent high-tech fans, not quite evaporating a sheen of perspiration that caused all his veins and tendons, and his twelve-pack abs, to pop out through his skin, as though the epidermis were shrink wrap laid directly over nerve and bone. According to this morning’s stats, Devin’s body fat percentage was an astonishing 4.5, which placed him into a serious calorie debt situation that in theory should extend his life span beyond 110 years. The slight up-and-down bobbing of his head and upper body was compensated for by equal movements of the robot arm, which used a machine vision control loop to track his attitude through a camera and to calculate the vector of translations and rotations needed to keep the huge screen exactly 22.5 inches away from his laser-sculpted corneas and the keyboard and other input devices within easy and comfortable reach of his fingers. A custom-made headset, with flip-down 3D lenses (currently flipped up and out of the way) and a microphone enabled him to dictate ideas or take phone calls as necessary. A chest harness tracked his pulse and sent immediate notification of any flipped T-waves to an on-call cardiologist sitting in an office suite two miles down the road. A defibrillator hung on the wall, blinking green.