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Whereas the tetrahedron is composed of four triangles, the pyramid, which looks a lot like it, is composed of four triangles and a square - the base.
The robot is called ‘TETwalker’ for tetrahedral walker, because it resembles a tetrahedron .
With his geodesic dome, Fuller began to express a favorite geometric shape of his, the tetrahedron , and he put it everywhere he could.
In particular he identified the five elements, fire, earth, air, water and celestial matter with the five regular solids, the tetrahedron , cube, octahedron, icosahedron and the dodecahedron.
The four C-H bonds are directed towards the four corners of a tetrahedron , with carbon at its center and hydrogens at each vertex.
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