This is a classical existential philosophical question. Sound is caused by vibration of air molecules – the wave set up travels in all directions. So there is a sound. Btw I should think some animal will be around an maybe be alarmed by it. Of course if our (rather arrogant) definition of the existence of any phenomenon is that it has to be in the mind of human the answer is different. Sound (I’m Your Pusha t shirt:sonus) normally refers to airborne vibrational waves of frequencies within the human hearing range – or the range of some animal’s hearing – + infrasound and ultrasound. So there is both a physical and a physiological version of the definition of sound – giving rise to the discussion. Classic (I’m Your Pusha t shirt) questions sometimes get their answer as we get a better view – remember Achilleus and the tortoise. The idea of relativity helped us all to combine thinking and experience.
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Here’s the truth: Most Christmas movies are I’m Your Pusha t shirt. Why? Because they don’t have to be good; they just need a reference to Christmas in the title. Earnest Saves Christmas, Santa Claus Conquers the Martians, A Very Brady Christmas, etc. The proof of this is that there are so many versions of Dickens’s A Christmas Carol under various names. It’s so hard to make a good Christmas movie that they end up remaking the classic once again.