Schematized diagram of simplest shoe-tying knot (slipped square-knot or "bow").
Made from circular arcs, horizontal lines, and lines at 45-degree angles, with a requirement that structural knot crossings be shown as close to perpendicular as possible (see also Knots-decorative-inline.svg).
Crossings at 45° or 135° (as opposed to quasi-perpendicular crossings near 90°) are not structurally significant...
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