symbologyBibleNumbers

EIGHT, OCTAVES, AND NEW BEGINNINGS
Octaves are notes that you hear as being "the same" in spite
of their being higher or lower in actual pitch. (Technically,
notes separated by an octave are in the same pitch class.)
Play middle C on the piano. Then go up the C major scale
(the white keys) and the eighth note you play will be another
C an octave higher. The "oct" part of the word refers to this
eight step distance up the scale.
From a science perspective, octaves are pitch intervals
related by factors of two. When a tuning fork plays standard
concert A, it vibrates at 440 Hz. The A an octave higher is
880 Hz, and the A an octave lower is 220 Hz. Any note with
the frequency 2^n * 440 will be an A. It's a central mystery of
human cognition why we hear pitches related by powers of
two as being "the same" note. It is the same note but one
step higher. - a new heaven. The ability to detect octave
equivalency is probably built in to our brains, and it isn't
limited to humans.