Here's how to make a Tensegrity Back Bone Model from a toilet paper tube and some balloons.

The model represents how the discs in the back create flexibility and shock absorbing between the vertebrae.

Step 1: Making the Vertebrae

Vertebrae are made by cutting 'wavey' rings out of a toilet roll. In each piece there are 3 'peaks and 3 'troughs'.
This is done with a small pair of scissors.

Step 2: Making the Discs

The discs used to go between the vertebrae are made from some ballons.
Cut where the ballon inflated off. Next, cut it into 2 circular discs.
Add a dab of contact glue to the 3 peaks of a cardboard ring. Attach the disc on top to the glue.
Add a dab of contact glue to the troughs of the cardboard ring and glue it to the disc of the previous ring.
Continue with the same process for the other rings.