Staring into a mirror in a dimly-lit room for a prolonged period can cause one to hallucinate.[7] Facial features may appear to "melt", distort, disappear, and rotate, while other hallucinatory elements, such as animal or strange faces, may appear. Giovanni Caputo writes that this phenomenon, which he calls the "strange-face illusion", is believed to be a consequence of a "dissociative identity effect", which causes the brain's facial-recognition system to misfire in an as-yet unidentified way.[7] Other possible explanations for the phenomena include illusions attributed, at least partially, to the perceptual effects of Troxler's fading,[8][7] and possibly self-hypnosis.