The curve \[ c(t) = (\cos(3t), \sin(3t), \cos(4t), \sin(4t)) \] traces a knot on a torus in four-space. When either circle factor of the torus is rotated, the knot fills out the torus with mutually-disjoint curves. Projecting these curves to the plane fills the unit square with a mesh of Lissajous figures.
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