I've been pondering about frequency, notes and octaves.
When you play any given note, it's octaves resonate harmonically.
I assume this phenomenon works in down as well as up octaves.
Which brings me to my ponder, how low can it go? I know we can only hear to 20 or so hrz (supposedly), and that all vibrations are technically sound. I wonder about ULF scale harmonics and how that plays into higher scales. Could this be a mechanism for 1000 ,10000, 1 000 000 year event cycles?
It's a busy mind today.