

Scott Cram Inner circle 2676 Posts 
What's open when it's closed, and closed when it's open?

MacGyver Inner circle St. Louis, MO 1419 Posts 
For a second I was thinking "electric circuit" before I relized that I had the definitions of a circuit reversed... hehe
***spoiler below*** A drawbridge? 
Jonathan Townsend Eternal Order Ossining, NY 26943 Posts 
That works from the perspective of traffic on the road. From the river it might be the reverse.
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Scott Cram Inner circle 2676 Posts 
What works?!?

magicgeorge Inner circle Belfast 4299 Posts 
Hmm, good one. I'm thinking along the lines of a dam or a weir that would only be available for public viewing when the flood gates are shut and therefore open when closed and vicaversa..close?

Scott Cram Inner circle 2676 Posts 
Magicgeorge is on the right path, but not quite there yet.

magicgeorge Inner circle Belfast 4299 Posts 
Tower Bridge
Although after I got it I reread John's post and he seems to have got it too. I'd originally dismissed John's post since Scott hadn't mentioned it. It doesn't matter about the perspective from the river, though, since for the ships the waterway may be closed when the bridge is closed but you wouldn't say the bridge is closed in the other sense it would still be open. I think. 
Ian McColl Inner circle 1484 Posts 
Railway crossing?
Ian
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Scott Cram Inner circle 2676 Posts 
MagicGeorge, that's one good example, but I'm looking for a general answer. Just say what type of bridge the Tower Bridge is, and you have the answer.
Ian, I'm not sure whether the railway crossing works, even from the perspective of the train. Sure, the crossing is open to the train when the crossing for the cars is closed, but the crossing really isn't closed to the train when the car crossing is open. 
Samuel Catoe Inner circle South Carolina 1256 Posts 
A drawbridge.
Author of Illusions of Influence, a treatise on Equivoque.
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0pus Inner circle New Jersey 1740 Posts 
Cf. MacGyver supra.

magicgeorge Inner circle Belfast 4299 Posts 
I knew it could be any bridge of that type I just felt like giving a nice UK answer

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