"World's Best Origami" by Nick Robinson

At the CDO Convention 2009, I taught this apple by Shuzo Fujimoto. I'm pleased to say that it took us less time than expected (only half an hour), and everyone had a nicely folded model in the end. The bigger, orange apple is the one I folded to display which model I'd be teaching, and the smaller, red one shows the paper we used during the session.

Paper: 16.5cm square of tissue foil
Model: 4.25cm diameter, 4cm height

This model is sometimes also called "magic rings" or "impossible rectangle". You could also call it "Borromean Rings": three rings linked in a way that by removing any one ring the other two aren't linked anymore, either.