I’m assuming this is the reason you “hear the ocean in a shell” or hear chimes when circling a wine glass. Is the only reason we can hear these is because of the phenomenon of putting them right next to our ears? Are there any weird facts based on age, etc?
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These both have to do with the shape.
In the case of the shell, it’s sound waves coming from elsewhere, reflecting around the inside of the shell, and into your ears.
In the case of the wine glass, the friction from your fingers is causing the wineglass to vibrate. It’s like when you flick a spring and it bounces back and forth, except the glass is very stiff and so the vibrations are high enough pitch to be heard as sound.
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