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- Five tetrahedra are laid flat on a plane, with the highest 3-dimensional points marked as 1, 2, 3, 4, and 5. These points are then attached to each other and a thin volume of empty space is left, where the five edge angles do not quite meet. (en)
- The stella octangula (en)
- Regular tetrahedron, described as the classical element of fire. (en)
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