>
>What it basically does is that it lets you connect points with springs
>that have various properties; the resulting tension in the model will
>automatically animate your object (with e.g. a spring with oscillating
>strength driving a whole 3D model in an extremely fluid way). It's based
>on Buckminster Fuller's Tensegrity ideas.
>

For a Smalltalk (VisualWorks) product that does this, see ElastoLab:  

http://www.simberon.com