/January_8,_2007&sq=Qlik&lang=&file=File:Villarceau_circles.gif)
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An animation showing how an obliquely cut torus reveals a pair of circles, known as Villarceau circles, named after the French astronomer and mathematician Yvon Villarceau. The circles have no known practical application, but are merely a curious and somewhat unexpected characteristic of the torus. Animation credit: Kieff |