This tensegrity structure hints at how the pelvis can be seen as based on the tension of the fascia in our bodies.
It comes in kit form, and you should be able to build it in an hour or two.
It is based on the work of Tom Flemons but adds both tough tension and adjustable compression features.
You can make the structure as a whole loose or very tight indeed by simply turning a few nuts!
You can see the development of the design of this model here:
The model can be useful for learning and teaching, and is strong and robust enough to last for years.