Desile Folding Chair thanks to Better Living Through Design... but being from a family of ample rumps, I suspect this one is for the slim-hipped and skinny jeaned alone.
It's hard to tell from this site whether these chairs really exist or whether they are just an idea (like the Staple City is just an idea), but I would quite like somebody to make me one. If only I knew somebody with a little woodworking know-how and a decent set of tools.... you know... like a boat builder or someink.