Auricles are symmetrically located on both sides of the head, and the main structure is cartilage. Auricles have two main functions: one is to repel foreign bodies and protect the external auditory canal and tympanic membrane, and the other is to collect sounds from the natural environment and import them into the external auditory canal. Cupping with your hand behind your ear is easy to understand the effect of auricle, because your hand is bigger than the auricle and you can collect more sounds, so the sound you hear at this time will feel bigger.