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Keep out of reach of children.
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For reasons beyond my comprehension, nearly every circular
door in existence uses hinges. This idea is to put the door
on/in a track, and roll it out of the way of the doorway.
Making such a door easy to open and close is a bit tricky, but
this *is* the halfbakery.
I say "nearly every,"
because google found precisely one
rolling door, [link], but it's not precisely a widely known to
exist architectural feature.
Bank with rolling door.
[goldbb, Oct 28 2015]
This Idea may not be original enough. [Vernon, Oct 28 2015]
The rolling rock (Even Gollal)
[pashute, Nov 01 2015]
||bigsleep, you mean that if I posted an idea about an dilating
door, it wouldn't get marked as WTCTTISITMWIBNIIWR, or
||For a halfbaked version, the door you seek is used in
airlocks on Deep Space 9.
||too much like a revolving door?
||Not anything at all like a revolving door, [travbm]. Try
reading for comprehension this time.
||You may look into ultrasonic levetation and magnetic levitation. The circular door has a hole that seals up one way and closes another as it rotates.
||[pash], for some reason your Wikipedia linked page
comes out upside-down and back-to-front on my
||Must be the Australian localisation.