THE CRAFT

The Perpetual Calendar — The Greatest Complication Ever Made, and Why It Matters
In 1762, a watchmaker in London solved a problem that had confounded civilisation for centuries — using nothing but metal, springs, and geometry. More than 260 years later, the solution still runs on your wrist. This is the story of the perpetual calendar: what it is, how it works, and why it is the complication that moves me most.