I haven't played with Pd-extended/Gem since 2008. I remember that there were examples of graphics patches in which geometric objects were joined using connections which represented the forces of attraction or repulsion between those objects. The result was that the ensemble of objects moved in a very natural way, simulating elasticity, gravity, etc. But I don't remember where those examples were or what the name of the package (library?) was.

Thanks for any reminder.

you are talking about pmpd

Thanks!