Holistic Ring was designed by Bram Cohen. He decided to come up with a design which has a nice holistic finishing move. As all rings part together simultaneously when mixing up this puzzle ring, it is quite hard to get it back together again, as you have to reverse the holistic move.
Watch the
YouTube video.
Read at the
Shapeways Forum.
Read more at the
Non-Twisty Puzzles Forum.
See also the version by
PuzzleRingMaker.