Mr. Tulley's transformation highlights a little-noticed movement in the world of professional design and engineering: a renewed appreciation for manual labor, or innovating with the aid of human hands. Using computers to model the physical world has become increasingly common; products as diverse as cars and planes, pharmaceuticals and cellphones are almost entirely conceived, specified and designed on a computer screen. Typically, only when these creations are nearly ready for mass manufacturing are prototypes made - and often not by the people who designed them.
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