“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Do me a favor and take a look at some laptop touchpads...
I just looked at about 7 before posting this to make sure, and yup... they all wear in the middle.
You may think you use the whole thing, but you really just stick to the middle in a circular pattern.