A test model constructed from 500 identical laser-cut card pieces. Squares touching corner to corner and rotated about their axis by 90° form a structure called a Kelvin Foam Truss [after Lord Kelvin]. This is the same as a wire-frame model of close-packing truncated octahedra, and is very closely related to the structure of cubic close-packing spheres.

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Copyright © 2012 Dan Dodds.

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