Physics
Magnetic Dipole Field
Φ ∝ cosθ / r²

The characteristic two-lobed dipole field, one lobe positive and one negative, sweeps around as the dipole moment slowly rotates.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).