on designboom today i saw 'pythagoras' (above) by chris jackson of northwards design, who was a tutor of mine once. made from 2mm folded aluminium, the stool is constructed with 3M tapeand will be launched at the ICFF new york in may.
i then went to his site, and saw a couple of other projects that caught my eye. one of them was 'two fold' (below), which is made using flush mounted carpenty hinges.
link to designboom article
link to northwards design