They are the brainchild of Austrian artist Klemens Torggler who has been working on different designs for some years. The steel version is, in engineering terms, beautifully elegant - but impractical. I can envisage some nasty trapped finger moments. The latest origami-like 'Evolution' model poses no such problems, having soft edges.
I don't know - last week it was origami robots, this week doors! Is this a trend?
For further information: www.torggler.co.at
With thanks to my friend in Spain, Javier Cavareth, for sharing