Hexagonal Close Packing and Triangular Orthobicupola

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Spheres are placed at the center and vertices of a triangular orthobicupola (Johnson solid J27). If such assemblies are placed side by side, then the spheres form three layers of a hexagonal close packing.
Contributed by: Sándor Kabai (August 2008)
Open content licensed under CC BY-NC-SA
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"Hexagonal Close Packing and Triangular Orthobicupola"
http://demonstrations.wolfram.com/HexagonalClosePackingAndTriangularOrthobicupola/
Wolfram Demonstrations Project
Published: August 11 2008