Watch Artist Implant a Net Art RFID Chip Into His Hand.
An article on Mashable said the "tattoo" contained in the RFID chip can be "swapped out, and replaced with any image or text file that is less than 1KB in size."
The "tattoo"—actually a graphic stored on an RFID chip that contains 1 KB of data—now resides in the right hand of artist Anthony Antonellis and can only be seen if you pass a smartphone over it.