Neil Harbisson sports a permanent electronic antenna on his head that is implanted and integrated into his skull.  Born color blind, it allows him to hear colors as sounds, the vibrations of which have led to his feeling colors as well.  In 2004, Harbisson's passport renewal was rejected as the British passport office would not let him be photographed with any type of headgear.  Harbisson replied that he identified as a cyborg and his antenna was an organ, a extension of his body. His renewal went through.  Read more here.