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Tutorial for the basic Umulius Rectangulum: https://youtu.be/EQbM-ZFUZns
Paper used in this video: $1 bill
Finished model: width of 7 cm or 2 3/4 in
This video describes how to vary the folding sequence for the origami "Umulius Rectangulum" designed by Thoki Yenn, so that you can fold it from US dollar bills.
That's right, it's money origami, or moneygami!
The model is also known as the magic rings, impossible rectangle, Umulius Rectangle or even "Borromean Rings": three rings linked in a way that by removing any one ring the other two aren't linked anymore, either.
Thomas Søndergard, son of the late Thoki Yenn, kindly gave me permission to make this video accessible to you.
Diagrams for the basic version are published on http://erikdemaine.org/thok/umulius.html
and in the book
"World's Best Origami" by Nick Robinson: http://www.happyfolding.com/book-robinson-worlds_best_origami
Playlist of modular origami tutorials: https://www.youtube.com/playlist?list=PL7664C92017852DA5
More origami: http://www.happyfolding.com