Such puzzles like the 'tree' one all go back to semantics - just what do the words like 'sound' really mean. If your definition of 'sound' implies that it must be heard to be detected, then ....

And if your definition of 'sound' just means an energy waveform, then....

Such puzzles are 'paradoxes' - the solution to such 'paradoxes' is to check the definitions of the terms carefully - you will always find at least two conflicting assumptions in the definitions of the words.

Bertrand Russell came up with some good ones.

One of his best is about the signs in a park which all show the location of all other signs but themselves. However at the entrance is a sign that shows all the locations of all the signs in the park that do not show the location of themselves. Should this sign show its own location?   


:-)

Robin
Scribe for The Fooles Troupe
(who keep arguing endlessly about such nonsense!)