This magnetic field animation has a lot, _a lot_ of paths and morphing, and I even submitted some feature requests as the result :)
Magnetic field changes from straight array to Halbach array and then to alternate array, which seems to be used in most magnetic beds for 3d printers.
Made in #Friction2D for this video by Lost in Tech:
https://youtu.be/xTfytJBLEn4
@triffen off topic, but I've been assuming #friction2d was a physics engine. Now I see it's an vector animation thing.

