I read this yesterday and it really stayed with me, enough to find this comment again. Do two notes an octave apart not sound harmonious in a particular identif

I read this yesterday and it really stayed with me, enough to find this comment again. Do two notes an octave apart not sound harmonious in a particular identifiable way to you? From another view, it may help to think about it like this: Tones have a certain relationship with each other, and we split that into octaves in Western music to keep track of them. Just like the number 9 precedes 10, and 19 precedes 20, 10 and 20 are "the same number" in base 10 since that's where the pattern repeates. We could count in another number system, but the underlying physical truth of the numbers would be the same.