Concentric "Spheres" (Truncated Octahedrons)
These Lego Technic "Truncated Octahedrons" ( https://en.wikipedia.org/wiki/Truncated_octahedron ) are made of only a few different Lego Technic parts. They form a sphere shape having 6 square sides and 8 hexagonal sides. For the innermost (yellow) Octahedron, the Lego Digital Designer (LDD) .lxf Building Instructions and Parts List can be found via https://www.flickr.com/photos/[email protected]/36838496752/in/datetaken-public/ . The lengths of the Technic Axles increase by 2 studs (2L) in each successive layer; in theory one could keep making larger and larger Octahedrons forever!
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