What you hear affects your emotions. Whether it is what someone is saying to you, a song that is happy or sad, an annoying dog, hearing others arguing or the sound of tree leaves rustling in a gentle breeze. Life would be extremely different without being able to hear.
Reverse engineering an eyeball would be great since we have plenty of samples but the design is too advanced for us to copy. From the ebook on Amazon "Brain Stirring and Inspiring" by Samuel J Alibrando