Our outer ear acts as a sort of funnel to channel sound waves into our inner ear where they are picked up by the ear drum. Here's a simple little experiment you can do. Roll up a sheet of paper into a cone shape with just a small opening at the narrow end. Hold the narrow end of your paper cone up to your ear and listen to the sounds around you. You'll be surprised how much louder they sound using your simple little amplifier. The shape of your cone, like that of your ear, helped channel more sound waves into your ear producing a louder sound.