7 arm SpHidron
According to Daniel Elderly the SpHidron is a curved development of the original Spidrons, which were composed of plain triangles.
More about spidrons:
http://en.wikipedia.org/wiki/Spidron
So in other words sphidrons are similar to spidrons except they are smooth. I am not exactly sure what defines this surface, but this image uses a spiral wave based on a double spiral.
I have to admit that I read the entire paper since was pretty interesting.
Read the paper here:
http://archive.bridgesmathart.org/2011/bridges2011-373.pdf
Watch video:
sphidron n6 rainbow
Tiene la forma perfecta para una turbina de jet como la Gota de agua la forma aerodinamica perfecta .
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