Like a library, but for tools

A new service appears in the feed with a single line under the picture: like a library, but for tools. Borrow the drill, use it for an afternoon, bring it back.

Nobody reading it imagines silence, shelves or a librarian stamping a card. They understand that the advertiser has borrowed an idea they already hold and is asking them to bend it, keeping some parts and dropping others. Shared, borrowed, returned: yes. Books and quiet: no. In one line, a stranger has explained something that would otherwise take a paragraph.

But only if the reader does the work. Some people do it without effort: they hear "like a library, but" and immediately start subtracting. Others catch the first noun and stop there. They picture something dusty and municipal and scroll on, faintly puzzled about why anyone would advertise a library.

Most new ideas reach us this way, not only in advertising. A new kind of shop is a market stall that comes to your door. A new drink is close to one you know, but sharper. You take what you already understand and adjust it by whatever follows the "but". It is a kind of arithmetic done with meanings instead of numbers, and it only works if the listener is willing to do the sum.

Nobody is born good at it. People who seem quick at it have simply had more practice at asking what a comparison is for, rather than what it literally says.

It is worth getting better at, on both sides of the screen. The alternative is a world in which nothing can be explained except by what it already is.