Balance requires the modulation and integration of multiple sensory information, among which the vestibular apparatus of the inner ear plays an essential role. The management of all informations is assumed by a system whose adaptive capacities are much faster than we thought until recently, as demonstrated by the experiments carried out in human during the development of a vestibular implant designed to restore the lost function. While these adaptive capacities have the advantage of allowing all kinds of activities, they also have the disadvantage of producing various sensations, sometimes very strange. Enormous progress has been made recently in the investigation of vestibular disorders. However, given the complexity of the system, it must be admitted that many elements remain to be discovered. In the meantime, let us avoid considering the 'bizarre' phenomena that some patients report as the expression of a psychological disorder !