Lecture 15 - If a tree falls and no one hears it does it...

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If a tree falls and no one hears it, does it make a sound? “Hylas: You must distinguish, Philonous, between sound as it is perceived by us, and as it is in itself; or (which is the same thing) between the sound we immediately perceive, and that which exists without us. The former, indeed, is a particular kind of sensation, but the latter is merely a vibrative or undulatory motion in the air. Philonous: Tell me, Hylas, to which of the senses, think you, the idea of motion belongs? to the hearing? Hylas: No, certainly; but to the sight and touch. Philonous: It should follow then, that, according to you, real sounds may possibly be seen or felt , but never heard .” (FP, 208)
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Sounds that we hear do not exist in the air (1) Motions can be seen and/or felt. (2) Sounds cannot be seen or felt. -------------------------------------------------------- (3) Therefore, sounds are not motions. -------------------------------------------------------- (4) Therefore, sounds are not vibrative motions in the air.
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Do material objects have colors? “Philonous: be pleased to let me know, whether the same colours which we see exist in external bodies, or some other.
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