Jesika Foxx has permanently purple eyeballs, and an elf-like ear. Her husband, Russ, has a pair of horns under his skin.
Stelarc, a 72-year-old Australian, has an ear on his arm. Soon he hopes to attach a small microphone to it so people can, via the internet, listen to whatever it hears.
Meow-Ludo Disco Gamma Meow-Meow - yes, that's his legal name - has the chip from his Sydney travel card implanted into his hand.
I met all these people during BodyHacking Con, in Austin, Texas.
The scarification lines on that Russ fellow are lovely.
The design lends itself to subtle markings, rather than more bold inked lines.