You can assume the lack of deaf people, as "no one is around to hear it," whether deaf or not. But you are on the right track.
Keep a green tree in your heart and perhaps a singing bird will come (Chinese proverb)
andNo matter how low a cotton tree falls, it's still taller than grass. (Krio proverbs – Sierra leone)
Yet, as stated in previous replies on this thread, a tree is not always green, or brown for that matter . . .
Sure: 'a tree'.
But 'the proverbial tree' - in that Chinese proverb - is green.
I am not sure you can say I am wrong. You can say that was not the proverbial tree you were referring to, but I satisfied the question as given.
Well sowhatifit'sdark, I'll give you 10 creativity points for originality and research in looking into Chinese proverbs. However, credit for the philosophically (and logically) correct answer must go to sky1. "Proverbial," in this instance, was an adjective describing that one tree everyone talks about that falls in forest when no one is around and no one is around to hear it. But nevertheless, creativity is worth some decent credit.
Learned