Auditory illusion
Why do you hear the sea in a shell?
If you put a shell on your ear, it is working on the outside of the shell surrounding ambient noise. Certain frequencies are filtered out depending on the shape and size of the shell. The smaller the shell the higher the noise.
The noise of the noise in the shell is usually greater than the ambient noise, because the air pressure waves (what we call sound) are amplified by numerous reflections in the shell.
The result of these physical processes is the transmission of incentives to the hearing center in our brain. With which our imagination further complements: the sound of the sea, an association with the shell.
Source: According to Fillet, K. & Speybrouck, S. (2003). Boys & Science2. Roeselare: Roularta Books.
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