There are certain physics involved, and speculations about the physics of the ear drum that make certain intervals pleasing, intervals that make us years for other intervals. Are these things universal, cultural, or both.
And then there is the crazy mixed up way we try to put all this stuff into words so as to be able to think about it. For that we need not physics but Ludwig Wittgenstein, specifically I recommend On Certainty.
The tiger you are grabbing is huge and has more than four legs.
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