The Art of Noticing

The Art of Noticing

Prime Directive

A delightfully geeky attention habit; Off-Putting Flier of the Month; and The Heard

Rob Walker
Sep 05, 2025
∙ Paid

I recently had a fun exchange with a reader that I want to share, but before I get to it, a quick plug: Lots of great responses already to the September Savor of the Month prompt, Ornamentation. See what others have posted so far here — and join in!

Okay, so today’s item starts with these pictures, sent to me by reader Danesh Forouhari:

Danesh has a fun attention habit: Noticing prime numbers. In this case, the curiously specific fine amounts are both examples. (If you need a (ahem) primer on prime numbers, try this.)

But as Danesh noted — sending more examples — once you tune in to prime numbers, you might notice them a lot:

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