Paper used in this video: 6 sheets, 17 cm by 6 cm
Finished model: width of 8.5 cm
* A4 cut in half lengthwise
* 6 in by 2 1/8 in (model width: 3 in)
* any rectangle with a ratio of 1 by square root of 2 (approx. 2.8284)
This video describes how to fold a fantastic modular origami model designed by Thoki Yenn (aka Kalmon). It's 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.