What does it mean that a tensegrity is super stable?
This is a very strong condition on the geometry of the structure. There is a particular calculation that can be made in terms of the stress that exists in the structure. Certain numbers, called eigen values, calculated. If they are positive with altogether only 4 of them being 0, the structure will be super stable. A consequence of this is that the structure is globally rigid in all dimensions. This means that if there is any other placement of the nodes satisfying the cable and strut conditions, then this placement will be congruent to the original. It will be the same configuration, possibly rotated or reflected and then rotated. Another consequence is that if you build this structure it will stay stable and rigid, even when the stress is increased relative to the stiffness. This is very handy for these tensegrities, since the stiffness of the cables especially tends to be very soft.
