Dismountable cardboard stool
I just had so much cardboard laying around that decided to try something REALLY simple, quick, easy and funcional! Let's say you need a few of these to sit some friends occasionally. You can make a bunch of these, dismount them and store in a drawer. You can always glue two or three layers to make them stronger. Cardboard is unexpectedly strong when you place in vertically!
Até já!