In article , "Dee D. Flint"
writes:

You've got to define sound first. For example if you simply define it as
waveforms in the air, then yes it does make a sound. However if you define
it as the result when waveforms in the air are converted to a form that can
be interpreted by the brain, then it doesn't make a sound.

Either way though you are right that the tree is still there.

There is NO such person in any QRZ listing of Canadian or USA radio
amateurs. Ergo, that person doesn't exist.

Why do you believe that spectres or the imagination are "rational,
civil" persons?