Yin and Yang is much more than that... That's the shallow meaning spread around by popular culture. I had an argument with nos about yin and yang a long time ago, although I don't remember it... I'll find the link.

And that blindness thing, I'm just assuming, I have no proof. My reasoning was that closing my eyes, I can see blackness, but not the blackest blackness. That's because blackness signifies the absence of color. If the eyes are damaged or incompetent, the part of the brain designed to see would still be in receiving mode, it just wouldn't be receiving any light, so it would be a deep blackness (probably?).

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