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A torus knot is a closed curve drawn on a torus (doughnut) with no self intersections. They are determined by how many times the curve goes around the outside of the torus, and how many times it goes through the hole. This one goes around 3 times and through the hole 5 times, like the design of several other sculptures I have made (for example, the tubular (3,5) torus knot pendant). In this desktop toy, the knot is formed by a circular groove in the surface of the torus, just the right size to hold a 1/4" radius steel ball bearing and let it roll freely in the groove. This piece does not come with such a ball bearing, but they are readily available, and I am willing to mail one to any buyer. Just push it into the groove (strong flexible plastic will allow that) and it will go in and stay there. Then tilt the torus to make the ball roll around three times, each time going into a different part of the groove, until it finally returns to a starting point. This gives the clearest illustration of the fact that the groove is a (3,5) torus knot, and is an amusing way to distract yourself from what you should really be doing! Maybe you can distract your boss from bothering you, too. Better living through topology. Compare this to my Groovy Mobius Figure 8 Knot, which is the same idea applied to a figure 8 knot.