Life is a revolving door

Seriously, what is the deal with revolving doors? I mean those4 elctronic ones which constantly circulate, so you have to get in pace with the door and duck in as it swings by... I am currently temping at a place with a revolving door, but probably 90% of people will walk to the conventional dorrs either side and open them. This got me pondering possible reasons for installing a revolving door:

1/ to discourage terrorist attacks. It's very difficult to burst in brandishing bombs and guns and things when you have to slow down to align your step with the speed of an electronic door. And because they're normally glass, you'll be seen before you can use the element of surprise.

2/ hygiene? Maybe it's better not to touch the doors? I don't know...

3/ you're really busy and don't have time to talk to people, so you have them on high rotation. This way, they're not allowed out of the door, they just call out their greetings as they shuffle past.

4/ to discourage people getting to know each other, by seperating them each into their own door-copartment. This way, when they get to their individual cubicles, they are used to the isolation and don't waste precious work-moments on pointless diversions such as conversation.

5/ as the designer of the door, you are just a nasty eprson who laughs at other people's discomfort; either confusion and panic as they try to enter and exit the door; or nausea as they find it all too much and just keep gong round and round...

6/ it's actually a piece of installation art

7/ the revolving door is a subtle and overlooked artistic metaphor fof life itself, and the neverending inanity we fill our lives with.

Yeah. Deep, huh? I still don't get the point of them.