Hypotrochoid is the mathematical term for a line traced by a fixed point in a circle (your pen) rolling around a bigger circle.
These beautiful flowing curves have fascinated mathematicians for centuries. Different points within the circle produce wildly differing patterns. This a classic and absorbing drawing set, easy and fun to use that will throw you back to your childhood!
This 11 piece set comes in a tin case and includes (1) Green (1) Red and (1) Blue Pen and also comes with instructions.
Measures: 8.25L x 1"W x 3.25"H