Masters of one of the world’s most revered forms of analog craftsmanship take on the smartwatch. ... Swiss watchmaking emerged from a radically different background, one rooted in meticulous manual labor. The industry got its start in the 16th century after John Calvin persuaded the City Council in Geneva to impose sumptuary laws banning jewelry, and the city’s skilled jewelers joined forces with the makers of pocket watches instead. Later, French Catholics chased Protestant Huguenots out of their country; many of these French exiles happened to be watchmakers, and they settled in Switzerland. In the mountains of the Jura region, they encountered local farmers who spent half the year indoors and idle and who turned out to be extremely patient and detail-oriented. The émigrés hired them to spend their winters hand-polishing tiny metal components for the “movements,” the watch’s spring-driven inner workings. ... By the 20th century, Swiss watches had become famous for their reliability and complexity. They are also marvels of energy efficiency, because dozens or even hundreds of components depend on tiny wound springs for power. Each new “complication” — say, a calendar that advances the date with a satisfying snap at midnight — demanded a new set of gears and more energy, thus requiring ever more clever compensations. A mechanical watch is both a dance with and a fight against physics.