Heinlein’s doors famously “iris” open, and the doors in my novels “hiss” open. That gives us a pretty good idea what it sounds like, but what does it look like?
This:
That part at the end where he presses the two keys and steps through–that is almost exactly what I imagine it looks like when one of my characters palms an access panel.
Someday when I’m a homeowner, I’m going to install doors like this in every major room in my house. I kid you not. And if I run out of other projects, I’ll build a standing jacuzzi like the shower units in my novels, with nozzles that blast you from all sides and a drier that blows hot air from the top. That is a Youtube video that I would love to see.
Live long and prosper, my friends. May the stars of Earth continually align in your favor.