Okay. Quite frankly, until you reminded me, I forgot it could be called
a spiral staircase. It is, after all, only one level and I tend to think
of spiral staircases as being more than one level.
The spiral is supposed to be one of the more common shapes in nature.
Marnie aka Doe :-)
On 7/6/2017 1:35 AM, Alan C wrote:
OK. I did some more research. There are essentially two types of 3D
spirals which are simply 2D spirals stretched along the z-axis. The
cylindrical type with constant radius also known as a helix as found in
"spiral" staircases & DNA molecules (double helix) and the conical type
with increasing radius as in many types of seashells & whirlpools.
Alan C
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