scott wrote:
>> http://en.wikipedia.org/wiki/Nephroid
> 
> isn't this the same as
> 
> http://en.wikipedia.org/wiki/Spirograph

It should be possible to draw a nephroid with Spirograph, yes. (A 
nephroid is a type of epicycloid, and Spirograph draws epicycloids.)

A nephroid is one specific curve in a very large family. I posted that 
link because I liked the name, and because many rather interesting 
articles are directly reachable from it.

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