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Interesting example of an anti-spiral, which spirals in towards the centre, instead of outwards.
http://fyfluiddynamics.com/post/182245831716/spiral-formations-are-common-in-nature-from
Interesting example of an anti-spiral, which spirals in towards the centre, instead of outwards.
http://fyfluiddynamics.com/post/182245831716/spiral-formations-are-common-in-nature-from