A helix is formed by rhombohedra with tip to tip connection. This can be regarded as a backbone of structure consisting of rings at the nodes made of tetrahedral and octahedral parts of the rhombohedra. Polar zonohedra enveloping the rings have a height corresponding to the pitch of the helix, so their poles are at the centers of the rings. When the tetrahedron rings are augmented with the octahedral parts (corresponding to a shape created when the rhombohedron is cut in half perpendicularly to its long diagonal), then hexagonal faces are obtained. These hexagonal faces of the rings meet, thus making the helix continuous.
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