Wolfram Mathworld!, the elegant hypotrochoid is "a roulette traced by a point
I did a little card last night while sitting in front of the TV. I loved the background paper I created with the spirograph and I decided that it needed some glitter.
In keeping with the old school flavor, I used good ol' Elmer's glue and big, flaky glitter. Hmmm. Do you like the results?
![](http://2.bp.blogspot.com/_MJpLJeoAW-I/R4wNjOPzfBI/AAAAAAAAAH0/mup0cQZOvVQ/s400/spirograph+1.jpg)
The set is cute, portable, fun, quick, and satisfying. There are so many different options and combinations. I have just touched the tip of the iceberg. I want to see if I can find a pen that would let me emboss these images!
The set comes with three pens (red, blue, and green), two gear-frame thingies, and three different gear circles for drawing fun!