Simulation of physical laws. The nodes are joined to a complex form by elastic links. The behaviour of the construction emerges completely from the interaction of the forces in each link. You can drag the nodes and fix them at the grey dots.

[TENSION] - Tension of the links

[FRICTION] - Friction on the ground

[GRAVITY] - Turns gravity on or off

[FORMS] - Some predefined constructions

Source: rubbergrid.zip