The 90-Minute Lounge Chair was named for its ability to comfortably accommodate sitting for long durations. For an unupholstered, uncontoured chair made of flat parts, the lounge is deceptively comfortable. Its seat and back are positioned and proportioned to balance your body in a relaxed posture. This project introduces new machining and assembly techniques. We’ll walk you through the process of milling a pair of pockets into each of the chair’s sides, making the matching hardware keys that lock parts into place, and fabricating a jig that you’ll use during the assembly process.