There’s a handful of Chair Designs made out of cardboard; here are just a few cherry picked ones.
These are David Graas FIY Cardboard Stool and Chair, but have a look on his website for more sustainable and creative designs, especially ‘Stefan Loves Stefan’, it’s just great!
Finish It Yourself Stool
Finish It Yourself Chair
Aranda/Lasch is an architectural studio based in New York run by two guys, ‘Benjamin Aranda and Chris Lasch, the studio designs buildings, installations and objects through a deep investigation of materials and structure.’ Pretty cool.
There’s no reference to this video other than it being on youtube under ‘collapsible stool’; even though the quality isn’t great, it’s still a simple and brilliant design!