This scene animates a physical model of piano keys, where each press launches a glowing note bar timed to a looping melody. Real pianos produce pitch by striking tensioned strings with felt hammers, and this app uses the same 12-tone equal-tempered scale: each semitone's frequency is the last multiplied by the 12th root of two, so every octave exactly doubles in frequency (A4 is tuned to 440 Hz by international standard). A full 88-key piano spans about 27.5 Hz (A0) to 4186 Hz (C8), and the rich tone of each note comes from overtones - integer-multiple harmonics ringing above the fundamental frequency. Drag to orbit, scroll to zoom, right-drag to pan.