Christopher Butler writes a wonderful essay about the “best interfaces we never built,” exploring the UIs from sci-fi:

Science fiction, by the way, hasn’t just predicted our technological future. We all know the classic examples, particularly those from Star Trek: the communicator and tricorder anticipated the smartphone; the PADD anticipated the tablet; the ship’s computer anticipated Siri, Alexa, Google, and AI voice interfaces; the entire interior anticipated the Jony Ive glass filter on reality. It’s enough to make a case that Trek didn’t anticipate these things so much as those who watched it as young people matured in careers in design and engineering. But science fiction has also been a fertile ground for imagining very different ways for how humans and machines interact.

He goes on to namecheck 2001: A Space Odyssey, Quantum Leap, Inspector Gadget and others. I don’t know Butler personally, but I’d bet $1 he’s Gen X like me.

As UX designers, it’s very easy to get stuck thinking that UI is just pixels rendered on a screen. But in fact, an interface is anything that translates our intentions into outcomes that technology can deliver.