Three-Way Great Circling

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Three-Way Great Circling:

"I found to my amazement mathematicians making statements that you could not make three-way grids of great circles. ... And so I did find that nature is using three-way triangulation. This gave me then the realization that. ... You can take a flat piece of paper and it has no structural strength whatsoever-- it will crumple. But if I make it into a cylinder, a simple curvature, I now can use it as a column. ... that is where all the lines are parallel to each other like a barrel, but I saw that if I could make a three-way interaction of great circles, it would give me extraordinary stability. And that is really what compound curvature is."