Complessità (/komplessi'ta/ Italian, Complexity) is an innovative interactive dance performance that inverts the traditional human-machine interaction. In this performance Technology is the Operator and not the Executor. An algorithm that simulates a flock of birds manipulates the performer's movements through a wearable device ( Galvanic Vestibular Stimulator) that modifies the performer's balance perception. The human loses ownership of its movements and we enter a new dimension where the machine computes the moving human body. The flock direction is transposed to the performer through two electrodes positioned on the back of each ear. The electrostimulation of the inner ear causes an involuntary and immediate modification of the vestibular apparatus that controls motion, equilibrium and spatial orientation.