The first illustration depicts a tetrahedron inside the cube:
The next illustration depicts 2 opposing tetrahedrons inside the cube. The vertices of the 2 tetrahedrons exist at the same point in space as the vertices of the cube.
Looking at this drawing you can see how the vertices and mid-edges of a tetrahedron can be projected outward to meet a sphere that encloses the cube and touches its 8 vertices. These become the vertices of the dome.
The next illustrations show the mid-edges projected to a sphere the same radius as the vertices. Blues lines are added to show the hemisphere level.
This drawing shows the alignment of great circles and chords.
Octahedral geometry (yellow) becomes apparent - it's the same as the 2 frequency Class II Octahedral dome
To the PAPER MODEL of the Tetra-Dome
The Tetra-Dome top half is subdivided and made into a 14 ft diameter 2 x 4 dome with a 4 ft. vertical Base Option and door retrofit. It can make good enclosed space, low cost and functional.
Some diamond crystals have similar structure on a molecular level- see
American Museum of Natural History
Earth Science Australia
The Platonic and Archimedean Solids (VRML)
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