>>> The last nephroid is in capitivity.  The galaxy is at peace... ;)
>> ...alternatively, if you have a look at the article and some of the
>> articles lined from it, you get to see trippy mathematical drawings! :-D
> 
> Oh, I saw the gif animation, yes.

There's a whole world of Seriously Interesting Stuff out there - 
inverses, evolutes, envelopes, caustics, epicycloids, pedal curves... 
it's pretty mental stuff!

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