The balance wheel of a Rolex Calibre 3135 is a tiny, circular ego. It is made of Glucydur (an alloy of beryllium and copper that resists thermal expansion) and it sits at the heart of the movement, oscillating back and forth with a rhythmic, frantic precision.

If you hold it with a pair of anti-magnetic tweezers, you realize that this five-milligram circle of metal is the only thing standing between a functional timepiece and a very expensive paperweight. It represents the relentless, unblinking reality of time-a constant, incremental “tick” that doesn’t care about your mood or your milestones.

In my workshop, we call this isochronism (the ability of a pendulum or balance to vibrate in equal periods of time regardless of the amplitude), and it is the most honest thing I know.

The 4K Resolution of Memory

Hasan does not live in a world of isochronism. He lives in a world of stories, specifically one story that he has told me eleven times now. We were sitting at a coffee shop near the train tracks-the kind where the sugar jars are always a bit sticky-and he was describing his “Big Tuesday” for the twelfth time.

He remembers the exact shade of the digital numbers on