Sound is vibration, transmitted to our senses through the mechanism of the ear, and recognized as sound only at our nerve centers. The falling of the tree or any other disturbance will produce vibration of the air. If there be no ears to hear, there will be no sound.
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Edited by A84: 1/9/2015 1:06:12 AMAnd so, if there are no eye to see, or skin to touch, then it does not exist as a visible, tangible object.