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from Daniel Piker
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/