The balance system, also called the vestibular system, integrates all information about moves and positions of various parts of the body. The system makes it possible to react to every disturbance of our balance, whether voluntary or involuntary. Recovery of balance after a wrong step or of the eyes when turning around.
Our brain combines information coming from various systems in order to reach equilibrium/balance. Apart from information coming from the organs of balance in both ears, this also includes information from the eyes and from the rest of the body (such as the muscles and, more specifically, the muscle spindles).