> This reminds me a bit of how mystics often claim to have seen colors not seen in nature.

There is infinitely more wavelength info even in the visible light of nature than the crude three dimensional mapping our eyes can present to our brains.

One simple example: We can't distinguish green light from mixed blue and yellow light.

So my point, which I know I'm annoying slow to get to, is that we're nowhere near seeing "the colors of nature".

For sound we do much better.