Re: [math-fun] Borromean Rings

Dan wrote

Matthew Cook has a Borromean rings page: <http://www.paradise.caltech.edu/~cook/Workshop/Math/Borromean/Borrring.html> For a drawing by the little-known David Borromeo, see http://www.tweedledum.com/rwg/borrostar.htm (click to clarify). The puzzle here, if there is one, is to trick Macsyma's naive hidden surface algorithm into drawing this, despite a belief in planar faces.

I am "desperately" trying to find another copy of a Borromean puzzle sold briefly at the close of G4G5. Six identical (but for colors: two red, two blue, two yellow) injection-molded plastic half-hoops, with notches in the inside corners of their ends. Assembly was a serious dexterity challenge. --rwg PS: the puzzle sold for $5.