Rhythm, vibration, frequency, tone, timbre, shade…
If we had pianos that could play 40 octaves above the ones in our concert halls, where we'd tune to A483785116221440 instead of A440, and that would produce electromagnetic-waves rather than sound-waves, we could play colors. Imagine a MIDI controller that signals a group of LEDs - it's totally workable, but I don't have the programming skills. Anybody want to help build an instrument?
Also - take note of the colors present in different chords.
e.g., a major chord, G B D = RedGreenBlue …
This example, I think, only works for lifeforms with at least three kinds of photoreceptors (trichromats), like us humans. Dogs, for example, are dichromats; sorry dogs.
In music, an octave consists of a low note and a high note (and those encompassed), the higher note being exactly twice the frequency of the lower.
The human ear can detect roughly from 20Hz to 20KHz: about 10 octaves - this varies a bit from person to person, and the upper range diminishes with age.
The human eye detects light roughly in the 384 - 769THz range.
384 * 2 = 768
Isn't it interesting that the human eye can detect approximately one octave of light?
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