Hypotrochoid is the mathematical term for a line traced by a fixed point in a circle (your pen) which is rotated around the inside of a larger circle. These beautiful flowing curves have fascinated mathematicians for centuries. Different points within the small circle produce wildly different patterns. A classic and absorbing drawing set that is easy and fun to use. The set includes instructions and comes in a handy tin so it can be taken anywhere for hours of fun! 11 pieces: two hypotrochoid templates, each with three gears, plus red, green and blue pens. Size: 11.5 x 3.38 x 1.13 inches. Ages: 3+
WARNING! Choking Hazard - small parts. Not for children under 3.