If you have ever used noise cancellation headphones, you would become aware that it's possible for one type of sound, to completely cancel out another type of sound. The ambient background noise of an urban environment accumulates to such an extent, that sound congregates and forms a blanket of white noise. This ambient noise behaves like an unseen barrier in the air. And of course, sound from the ocean carriers across the 'air waves'. Therefore an urban environment will cancel out many localised sounds.
All sound is wave form or a vibrational frequency (sound wave) that travels via the air. When you pluck a guitar string, the string vibrates as a frequency or pitch and is amplified by the sound hole and body of the guitar. Remove the sound hole and the frequency is muted.
Beyond sound waves, there are 21 dimensional frequencies that can not be perceived by human senses. An environment within which, science appears as magic.
There have been experiments in the flat Australian desert where sound combined with super heated air and hills, can cause the aural illusion of coming from a completely different direction than the direction it is being heard.
Light also plays tricks against the laws of physics. The Min Min lights and Australien Skies 2 documentary reveals some of the science around how physics of our planet can conspire to conjure light apparitions and sounds that would make you think the night is alive with all kinds of creatures.