Uploaded December 2012 | Updated September 2026, 1 week ago

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The second shape in this video is a partial rhombic dodecahedron, it has 13 faces and is a major challenge to build, just like the 3-sided pyramid is tough to make.
It is interesting that when building a cubic shape of 8 units, each being a cuboctahedron, that in the center of that shape automatically there is a 9th cuboctahedron. In the second build this property is shown more clear as some of these central cuboctahedra are completed on the outside of the shape.
The unit originates from Damian O'connor, there is a link to his channel on my own channel.