Hi,
I recently had to think a bit about interactive elements for my tngible table.
Coming from these thoughts I came across a very cool 3D Topological modeling application : TopMod.
This app allows normal guys like me to model some cool 3D mathematical models stuff.
See :
Theses meshes can be exported to several common format such as .OBJ.
As a result it becomes easy to play with it into Blender 3D for example :