In short, it is “stories about possible worlds that are told through designed artifacts.” Think of it like designing a plausible but just out of reach future with a little reverse archeology thrown in.

A good example is the tricorder

Ethan Marcotte writes,

I just haven’t really felt much like, I dunno, being online. I’ve mostly stepped away from my public Twitter account because — well, it’s like the horse said. On top of that, I haven’t felt like writing,