This is a GH definition in Rhino.
It works by defining an octahedron, based on 4 user positioned points and certain geometric conditions, which allow it to join to copies of itself along 4 of its edges.
The slider then controls the single degree of freedom of the resulting over-constrained structural mechanism.
Based on the work of Y.Chen and Z.You.

spacesymmetrystructure.wordpress.com/2009/02/23/networked-bennett-linkages-in-grasshopper/