Hypotrochoid Art Set
Hypotrochoids are mathematical curves traced by a point in a circle (your pen) rolling around the inside of a bigger circle. These curves have been studied by mathematicians for centuries. Hypotrochoid formulas are complicated, but creating hypotrochoid art is easy and fun!
Set includes 2 x hypotrochoid templates, each with three gears, plus red, green and blue pens.