A gradient flow where the trajectories form orthogonal sets of coaxial circles. Some liberties taken in this visualization, because particles flow in both directions along flow lines and level sets. (short thread)pic.twitter.com/bz7eEInUwv
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The gradient used is the gradient of the angle ACB for two fixed points A and B. That's an unusual gradient, with a funky formula, but the circular trajectories follow from the fact that inscribed angles in a circle subtended by the same chord (AB here) are equal. 2/3pic.twitter.com/0Dj5OdGsm6
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Live version and code at @CodePen
https://codepen.io/brainjam/pen/NWKNoKR ….
(Doesn't work well on iPhone Safari, but what else is new.)
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