What for? Maybe leave the windows opened so you can hear all the traffic and construction work going on in your hood. Or, perhaps the door is designed to block the screams of kids and family members visiting from out of town.
“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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What for? Maybe leave the windows opened so you can hear all the traffic and construction work going on in your hood. Or, perhaps the door is designed to block the screams of kids and family members visiting from out of town.