Cymatics
Chladni plate patterns from sound — each frequency resonates a unique standing-wave shape
Slowly cycles through resonant modes (1,1) → (5,5) · watch patterns transform
or use Karel's recordings
Chladni figures are the standing-wave node patterns on a vibrating plate — literally what gives Resonance its name. Each frequency excites a distinct mode; as pitch rises the patterns grow more intricate. The symmetry you see is physical law.