I think this is related to Borromean ring system - three inseparable rings, yet no two are directly linked to each other. Cut any one ring, and the other two fa

I think this is related to Borromean ring system - three inseparable rings, yet no two are directly linked to each other. Cut any one ring, and the other two fall apart. http://en.wikipedia.org/wiki/Borromean_rings http://en.wikipedia.org/wiki/Borromean_rings