Tetrahedron = Join of Two Segments (10cm, 7bars@2m

This has become one of my favorites due to the emergent rhythms from its simplistic structure. The tetrahedron may be viewed as the join of two line segments; i.e. the set of all line segments connecting the two segments. Here we've taken just 7 equally spaced points in each of the two initial segments and joined those with 7^2=49 lines. Consequentially, this is also the complete bipartite graph K_{7,7}. I originally created this when thinking of the one tetrahedron triangulation of S^3 and its relationships to Combinatorial Knot Floer Homology and the standard contact structure on S^3.