Where maths and biros collide, the spirograph is formed
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Before you could draw an accurate likeness of your dog there's a pretty good chance you could weave a complex pattern with a pen and a piece of plastic. Spirographs, or hypotrochoid patterns, are rooted in some serious mathematics. Why do different sized circles make different shapes? And what does this humble shape have to do with the movement of the solar system? Come along and find out.