Simple Tetrahedron

Seeing as how Tetrahedrons are a fairly basic building block, I'm always looking for new ways to construct them. I have been somewhat inspired by the makings of mrkim. I went out and bought some vinyl tubing to play with. while I was playing with it for motor shaft couplings, I got the bright idea that it could make for pretty easy vertices for round shafts as well.

This thing is a simple vertex constructed from vinyl tubing. There are no actual files, only pictures that show the techniqu