This is mindblowingly great. I guess it goes to show how intuitive [physical] models can be if you choose the right thing [energy function] to do [to minimize],

This is mindblowingly great. I guess it goes to show how intuitive [physical] models can be if you choose the right thing [energy function] to do [to minimize], and design an algorithm to successfully do so. It's beautiful that they chose rigidity too -- it is an extremely natural behavior that most biological things would default to. And it's great fun to play with!