I’ve got two machines on me.

One’s strapped to my left wrist. The other lives in my pocket.

The one on my wrist can tell me the time (precisely in 12 hour format, roughly in 24), the day of the week, the month of the year, which year of the leap year cycle we’re in, and the current moon phase. But that’s its limit. There’s no software, only hardware. It’s programmed in springs and gears and levers and jewels.

The one in my pocket can tell me anything and do just about everything. It knows my voice, it responds to my touch, and it even instantly recognizes my face. This machine even knows the angle, velocity, and distance it travels when I swing it around. And it always knows exactly where it is anywhere on the planet.

But sometimes I wonder which one is more modern.

The one in my pocket can do more, but only for a limited time. And then it can’t do anything. It dies unless it can drink electrons from a wall through a cable straw for some hours every day. And in a few years it’ll be outdated. In ten years it might as well be 100 years old. Is something that ages so fast ever actually modern?

And then there’s the machine on my wrist. It’s powered entirely by human movement. No batteries, no cables, no daily dependency on the outside world. As long as I’m running, it’s running. And as long as one person checks it out once a decade, it’ll be working as well in 100 years as it works today. It’s better than modern. It’s forever.

As time goes by, my pocket will meet many machines. My wrist might too. But when I look down at the machine on my wrist today, and know that in 50 years my son will be able to look down at his wrist at the same machine ticking away the same way it ticks today. That’s a special kind of modern reserved for a special kind of machine: the wonderful mechanical wristwatch.