The more you learn, the more you realize how many “obvious” things were actually invented recently, and usually by accident.

Take the idea that time moves in a straight line. Past on the left, future on the right, you’re somewhere in the middle. So obvious it barely registers as an idea. Except it wasn’t always.

A fascinating essay on Aeon traces the surprisingly recent origin of this metaphor and the wild chain of consequences it set off. Scientific instruments started literally drawing time as a line on paper. And once you’ve drawn time as a line, you start thinking of it as one. Philosophers ran with it. H.G. Wells ran with it further. The entire time travel genre flows from a scratch of a needle on paper.

But here’s what stays with me: Indigenous cultures never bought the line at all. For them, time was cyclical, living, not a road you walk down but something you’re inside.

The linear model isn’t a discovery. It’s a design choice.

Once you see it that way, you can’t help wondering what else we’ve mistaken for reality.