Hypo-wha? A hypotrochoid (from the Greek for under and the Latin for hoop) is a roulette formed by a point attached to a circle rolling inside of another fixed circle. None of that mattered when it came to my childhood Spirograph obsession, but I had to look it up when I came across this Hypotrochoid Art Set. This kit comes with two templates, three gears and three pens. We loved the aforementioned Spirograph, but Hasbro's chintzy revision has been panned by users. The Hypotrochoid Art Set gets good reviews and we appreciate the simple and compact kit design. Find it at Uncommon Goods ($8).
(Image: Uncommon Goods)