A timing difference is not the only way to tell from which side a sound came. Since the ears are at opposite sides of the head and the external ears have partic

A timing difference is not the only way to tell from which side a sound came. Since the ears are at opposite sides of the head and the external ears have particular (but unchanging [0]) shapes, a sound will be changed in a different but predictable way depending on the direction it comes from. This effect also helps with detecting whether a sound comes from the front/back or top/bottom of the listener. https://en.wikipedia.org/wiki/Head-related_transfer_function https://en.wikipedia.org/wiki/Head-related_transfer_function [0] Change the environment around the ear a bit, e.g. by putting a hand relatively close to the external ear and listen how doing that changes sounds.