Square knots, a sailor’s best friend. They’ve been around for 4,000 years or more. Mathematicians found that square knots are the sum of two trefoil knots mirroring each other. Or are they? This is what I saw in the sky, 0º S, 6ºW , 410 (nautical) knots from Null island.
More details on the journey and the Knot geometry project on my Patreon page