Humans are issued two octaves at birth — one of sound (about ten octaves wide, 20 Hz to 20 kHz) and one of color (just under a single octave, 400 to 790 THz). Every frequency in the universe, no matter how slow or fast, can be folded by repeated doubling into both. So a black-hole ripple, a radio line, and a beam of light each cast a shadow you can hear and a shadow you can see. This is that atlas. Click any row to hear its note.
one ribbon — ~60 octaves of frequency, each mark glowing in the color it folds to · hover to read
One octave of color
The entire visible spectrum spans a factor of just under two in frequency.0.982 octaves
Ten octaves of sound
Human hearing runs from roughly 20 Hz to 20,000 Hz.~9.97 octaves
ATLAS
Folded onto human senses
Each entry's true frequency, the musical note it lands on when folded into hearing, and the color it lands on when folded into sight. The octave-shift column is how many doublings (↑) or halvings (↓) that fold takes — and that number is the only thing here that's truly physical.