Physics
Resonance Response
A = 1/√((1−r²)² + (2ζr)²)
A sinusoidally driven damped oscillator: the response peaks near the natural frequency, and the peak grows razor-sharp as damping ζ shrinks.
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).