After fumbling with the doors, I came up with this idea, as I thought that this may benefit those who are building modern buildings, and you can also look through the glass.
First off, like the current doors, there is an iron version, and a wood version.
The door itself will take up to spaces, and will rotate from the middle. They will be free-moving. However, if you put an electricity current near it (switch or redstone torch under it), it will lock up and automatically revert back to 180 degrees.
Q:Can mobs push the door? A: Yes, but not if it's locked.
Q: What happens if you hit the door? A: It will swing. To destroy it, repeatedly hit the hinge.
Q: Drops? A: The double doors.
Q: What happens if I build something that's in its path? A: You can't build in it's neutral form (180 degrees), but anything in the actual path will stop the door.
Design basis (But with 2 panes, not 4) :
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In theory it sounds nice, but if anything, I think revolving doors in-game would be more cumbersome than regular doors.
A door is simply Open -> Enter. I suppose the only hitch is having to close it later, requiring you to turn around and that gets annoying. This is an advantage to a revolving door, no worrying about closing it!
On the other hand, a revolving door would have to be quite wide to comfortably navigate through. There's also the potential of getting stuck; what if multiple people try using it? As long as there's a lock function, the revolving door would be very abusable; others could lock people inside one of the door segments. As well, I think network latency and load on MP servers would make it hard for the door to operate smoothly; choppy rotation (cumbersome).
I predict a lot of problems arising if this were to be implemented into the game.
What about an automatically opening and closing gate?
The solution, I believe, is quite simple. Right-clicking on the door will open it up just a crack- and then you push your way through one of the sides. Once the door has done a complete 180 degree turn it "locks" again.
The only thing that will cause a door to become "unlocked" is a player right clicking on the door or a Redstone Wire... logic gate... thing. :]