Cuando de chico visitaba a mi abuela que vivía en el centro, en el camino había un edificio con un gran cartel de neon que era un cierre que se abría y se cerraba
the zipper is one of the most underrated mechanical engineering achievements in history and I think about it more than is probably normal
let's actually look at what it's doing. you have two strips of interlocking teeth, each one a tiny precisely-shaped hook. a slider (which is just a wedge with a very specific internal geometry) runs along them. on the closing side, the wedge forces the teeth together at exactly the right angle so they lock. on the opening side, it drives them apart cleanly. no motor. no electronics. no power source. just geometry doing exactly one job perfectly, every single time, for the entire lifespan of the garment.
that slider is doing something mechanically elegant that most people never think about: it's converting linear motion into a locking and unlocking mechanism across two independent flexible tracks simultaneously. if you tried to explain that as an engineering problem without showing someone a zipper, it would sound extremely hard to solve.
and it essentially never fails. think about how many times you've zipped and unzipped a jacket. thousands of times over years of ownership. the mechanism works. it degrades gracefully when it does wear out - usually it just gets a little stiff, it doesn't catastrophically break. for a mechanism that costs almost nothing to manufacture and gets used daily, the reliability is almost unreasonable.
but here's the part that actually gets me: the zipper was invented in 1851. it didn't reach mass adoption until the 1930s. that's 80 years of a working, functional, elegant mechanism just sitting there waiting for the world to figure out what to do with it.
it wasn't a technology problem. the zipper worked. it was a use case problem. nobody could figure out where it fit. early versions were marketed for boots and tobacco pouches. the fashion industry wanted nothing to do with it. it was considered a novelty.
then B.F. Goodrich put it on a rubber boot and called it a zipper (named after the sound it makes) and suddenly people got it. then it went on flight suits. then trousers. then everything.
80 years. not because the engineering was wrong. because the context hadn't caught up yet.
there's a version of this story that applies to almost every transformative tool. the technology exists. it works. it's elegant. and it just sits there, waiting for someone to find the use case that makes it obvious. the zipper just happens to be the most literal example of that gap between invention and adoption that we interact with every single day, usually without thinking about it at all.