Square Knot

Square Knot is the sum of Trefoil Knot.

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Square Knot, rotating around a vertical axis. Note that the square knot is symmetric with respect to the origin. It has 180 degree rotation symmetry about the x-axis and the composition of these two symmetries is reflection in the y-z-plane. Compare with the Granny Knot.
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Square Knot, rotating view. (anaglyph)