The trefoil knot is the simplest “knot” in mathematics. Basically one can define a knot to be a smooth embedding of the unit circle into three space. There are right handed and left handed versions.
Well, it turns out that these knots appear on yoga pants:
Of course, this might be some sort of satellite knot of a trefoil (a knot with a trefoil companion) but one never knows until one takes a better look!
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