OK how do we build it in wood?

[flying haggis]

https://youtu.be/umfvm8I9_oU

 

[AndyT]

Plywood and piano hinges?

And something clever at top and bottom which I can't quite visualise!

 

[Bm101]

How do you slam it after a row with the Mrs though? She'd have a full 9 seconds to get the last word in. That's a list not only of all my faults but all the work I still need to do on the house. *shudders

Some more witchcraft, probably fairly well known on here I guess.
https://www.youtube.com/watch?v=tOp5j_57LAE

 

[Jonzjob]

Some of the history

http://www.dezeen.com/2014/02/11/door-r ... -torggler/

This one is a doddle though

http://all-that-is-interesting.com/klemens-torggler

 

[rafezetter]

this version should be easy to imitate, the weighting would have to be worked carefully though:

https://www.youtube.com/watch?v=_XOCDLrfwh8

 

[thick_mike]

That video led me to this...

http://youtu.be/Uxr4YH4MqQ4

 

[NazNomad]

I'd rather accidentally shut my fingers in a 'conventional' door than a 'guillotine' door. :-D