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" If a tree falls in the forest and nobody is around, does it make a sound? "
Breaking the Time Barrier: The Race to Build the First Time Machine - ˹ 20
Jenny Randles - 2005 - 288 ˹
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Color for Science, Art and Technology

Kurt Nassau - 1997 - 490 ˹
...This is not merely a matter of the terminology that we choose to employ, as in the moldy riddle, "If a tree falls in the forest and nobody is around, does it make a sound?" That question is readily answered once the questioner is obliged to specify whether 'sound' is taken...
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